EQ Tests of Electrical Equipment Used in Japanese NPP

2017 EQ Technical Meeting @ Clear water beach Nov.8 th -10 th . 2017

EQ tests of electrical equipment used in Japanese NPP

Nov.10 Th .2017

Yasutaka Eguchi

Mitsubishi Heavy Industries, LTD 7IS-AZ-20170065 R0

© 2017 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. This presentation is based on the studies performed by The Cable Ageing Working Group in The Federation of Electric Power Companies of Japan, consisted by Japanese utilities and plant suppliers including; ‹ Hokkaido Electric Power Co., Inc. ‹ Tohoku Electric Power Co., Inc. ‹ Tokyo Electric Power Co., Inc. ‹ Chubu Electric Power Co., Inc. ‹ Hokuriku Electric Power Co., Inc. ‹ The Kansai Electric Power Co., Inc. ‹ The Chugoku Electric Power Co., Inc. ‹ Shikoku Electric Power Co., Inc. ‹ Kyushu Electric Power Co., Inc. ‹ The Japan Atomic Power Co., Inc. (JAPC) ‹ J-power/Electric Power Development Co., Inc. (EPDC) ‹ Toshiba Co., Hitachi-GE Nuclear Energy, Ltd, and Mitsubishi Heavy Industries, Co. Ltd. with Mitsubishi Electric Co.

1. Purpose 2. EQ Tests 1. Cables 2. MOV actuators 3. Conclusions

• “Assessment of Cable Aging for Nuclear Power Plant (ACA)” done by JNES proposed suggestions to the Environmental Qualification (EQ) test method of cable in Japan. • Thermal and Radiation simultaneous aging shall be considered • Tentative value of the activation energy at temperature of actual plant shall be 62.8kJ/mol (15kcal/mol) • JNES-RE-2013-2049 “Guide for Ageing Evaluation of Cables for Nuclear Power Plants” (called “ACA guide”) has reflected the suggestions. • NRA, Japanese regulatory body, required the EQ test of cable based on this guide. • EQ tests of electrical equipment in accordance with ACA guide have been done by Japanese utilities and plant suppliers.

‹ Specimens ① Cables • 8 vendors, 21 types of cables

② Electrical equipment • MOV actuator, electrical penetration assembly, Transmitter, coaxial connector and etc.

• Specimen V Type: FR-CPHS V Insulation material: EP rubber V Conductor Number: 4 V Conductor size: 3.5mm2 V Manufacturer: Hitachi Cable Co. Ltd. V Used years: 15.5 years in NPP • Test sequences a. Baseline functional test b. Simultaneous, thermal and radiation, aging test for normal condition c. Functional test d. DBE radiation exposure test e. DBE environment test f. Acceptance test, withstand voltage test

b. Simultaneous, thermal and radiation, aging test for normal condition

Service Service Aging test condition condition Life 50˚C 40 years 120˚C negligible 137 days -0.005Gy/h 50 years 120˚C *1 177 days 60 years 120˚C *1 217 days 60˚C 16 years 120˚C 16.5Gy/h 106 days -0.3Gy/h 25 years 120˚C 15.3Gy/h 178 days 30 years 120˚C 15.0Gy/h 219 days

*1: Radiation degradation is estimated, because radiation rate is low .

d. DBE* radiation exposure test • Total dose: 1.5MGy • Dose rate: under 10kGy/h (Note 2 ) Chemical spray

Heating e. DBE* environment test steam Steam Steam

190 ℃ 4.22 Note 1:within 1 minute 2

kg/cm G 150 ℃ Note 2 :H 3BO 3(2000 ～ 3000ppm)

4.22 +NaOH(PH8.5 ～ 10) kg/cm 2 G 123 ℃ 123 ℃ Temperature Pressure 2.46 1.22kg/cm 2 G kg/cm 2 G

Note1 300sec Time

3Hr

1 Day

15 Days * The DBE is inside containment condition at LOCA

f. Acceptance test, withstand voltage test Service Service Life Withstand test condition AC1500V-1min. 50˚C 40 years success -0.005Gy/h 50 years success 60 years success 60˚C 16 years success -0.3Gy/h 25 years success 30 years success

• The specimen withstand the tests that a qualified life is 60years on 50˚C - 0.005Gy/h and is 30 years on 60˚C - 0.3Gy/h.

• Specimen of MOV actuator V Type: SMB-OOO V Manufacturer: Nippon Gear Co. Ltd. • Test sequences of MOV actuator a. Baseline functional test b. Simultaneous, thermal and radiation, aging test for normal condition c. Cycle aging test d. Pressure aging test e. Vibration test f. Functional test g. DBE radiation exposure test h. DBE environment test

b. Simultaneous, thermal and radiation, aging test for normal condition

Service Life Aging test condition condition 60˚C 40 years 100 ˚C 120Gy/h 112 days -0.3Gy/h

c. Cycle aging test Open-close: 2000 times d. Pressure aging test 0.45MPa- 3min, 20 times e. Vibration test 0.75G, 5Hz to 100Hz to 5Hz at a rate of 2 octaves per minute

© 2017 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 11 2.2 MOV actuator g. DBE radiation exposure test • Total dose: 1.5MGy • Dose rate: under 10kGy/h h. DBE environment test • Open-close: 20min, 5 and 10hour, 1, 3, 5, 6, 7, 10 and 15day

(Note 2 ) Chemical spray

Heating steam Steam Steam

190 ℃ 4.22 Note 1:within 1 minute 2

kg/cm G 150 ℃ Note 2 :H 3BO 3 (2000 ～ 3000ppm) 4.22 +NaOH(PH8.5 ～ 10) kg/cm 2 G 123 ℃ 123 ℃ Temperature Pressure 2.46 1.22kg/cm 2 G kg/cm 2 G

Note1 300sec Time

3Hr

1 Day

15 Days

• EQ tests of electrical equipment based on the ACA guide have been done by Japanese utilities and plant suppliers.

• The Results of the EQ tests will be referred as the EQ tests satisfied the requirements of the ACA guide in Japan.