ML20031F476
| ML20031F476 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 08/31/1981 |
| From: | Borgen R, Humphrey T, Yost M EG&G, INC. |
| To: | Rosztoczy Z Office of Nuclear Reactor Regulation |
| References | |
CON-FIN-A-6453
| |
| Download: ML20031F476 (18) | |
Text
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EGG-EA-5539 AUGUST 1981 fog SYG75 AUDIT OF THE ENVIRONMENTAL QUALIFICATION OF NIM 6k323 N TC$g SAFETY-RELATED ELECTRICAL EQUIPMENT AT THE gp DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 & 2 t
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R. A. Borgen T. G. Humphrey NRC Researci anc ecanical
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s This is an informal report intended for use as a preliminary or working document Prepared for the U.S. Nuclear Regulatcry Commission Under DOE Contract No. DE-AC07-761D01570 FIN No. A6453 E
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INTERIM REPORT Accession No.
Report No. FGG-EA-5539 Contract Program or Project
Title:
Equipment Qualification Case Reviews Subject of this Document Audit of tha Environmental Qualification of Safety-Related Electrical Equipment at the Diablo Canyon Nuclear Power Plant, Units 1 & 2 Type of Document:
Technical Evaluation Report Author (s):
R. A. Borgen 1
NRC Reser.rc'1 anc Tec<1nica T. G. Humphrey M. W. Yost Assistance Report oa o' o cum'a':
August 1981 Responsible NRC Individual and NRC Office or Division:
Z. R. Rosztoczy, Division of Engineering This document was prepared primarily for preliminary or internat use. it has not received full review and approva!. Since there may be substantive changes, this document should not be considered final.
EG:.G Idaho, Inc.
t Prepared for the U.S. Nuclear Regulatory Commission Washington, D.C.
Under DOE Contract No. DE AC07 76f D01570 NRC FIN No.
A6453 INTERIM REPORT
0532J AUDIT OF THE ENVIRONMENTAL QUALIFICA 10N OF SAFETY-RELATED ELECTRICAL EQUIPMENT AT THE DIABLO CANYON NUCLEAR PLANT (UNITS 1 & 2)
Docket Nos. 50-275 and 50-223 Richard A. Borgen Thomas G. Humphrey Max W. Yost Reliability and Statistics Branch Engineering Analysis Division EG&G loaho, Inc.
NRC Researc1 anc' Technical Assistance Report L
ABSTRACT The Diablo Canyon Nuclear Power Plant (Units 1 and 2) was audited to determine the environmental qualification of safety-related electrical equipment. Results of the audit are St....narized in this report.
FOREW0a0 This report is supplied as part of the " Equipment Qualification Case Reviews" being conducted for the U.S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation, Divisiin of Engineering, Equipment Qualifica-tion Branch by EG&G Idaho, Inc., Reliability and Statistics Branch.
The U.S. Nuclear Regulatory Commission funded the work under the authorization, B&R 20-19-04-15, FIN No. A6453.
d ii
CONTENTS 1.0 INTRODUCT10ti....................................................
1 2.0 EVALUATION......................................................
1
3.0 CONCLUSION
S.....................................................
2
4.0 REFERENCES
2
~
APPENDIX A--QUALIFICATION DEFICIENCIES FOR INDIVIDUAL EQUIPMF.NT ITEMS.................................................
3 APPENDIX B--SUMMARIES OF CENTRAL FILE REVIEWS........................
8 iii
I i
AUDIT OF THE ENVIRONMENTAL QUALIFICATION OF SAFETY-RELATED ELECTRICAL EQUIPMENT AT THE DIABLO CANYON NUCLEAR PLANT (UNITS 1 & 2)
1.0 INTRODUCTION
On July 27-31, 1981 a team comprised of representatives of the Reli-ability and Statistics Branch of EG&G' Idaho, Inc. and NRC staff conducted an audit of the environmental qualification of safety-related electrical equipment at the Diablo Canyon Nuclear plant. The work effort consisted of:
(1) a pre-audit review of the licensee's. submittal, (Ref. 1), (2) an audit of the licencee's central files for selected equipment itens, and (3) a vi<ual inspection of.the equipment items for which the central files were audi -d.
Qualification deficiences for individual equipment items are pi;/idtd in Appendix A.
Summaries of the central file reviews are provided in Appendix B.
2.0 EVALUATION General-areas of concern which remain as a result of both the audit and the pre-audit review are as follows:
1.
Electrical equipment exposed to the barsh radiation enviror..nent proauced by post-accident recirculation fluids was not identified and, therefore, not qualified.
2.
The environmental qualification submittal asstmed a uniform dis-tribution of radioactivity throughout the containment at time-zero. This is not in agreement with NUREG-0588..
1 3.
On those items where a temperature' deficiency is noted analysis was generally used, but with no margin.
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4.
In some cases the licensee considered individual itcms qualified without adequate documentation.
5.
Where present, test report anomalies were not adequately addres-sed as to their effect on specific plant items.
3.0 CONCLUSION
S As a result of the audit it was concluded that the Diablo Canyon environmental qualification of safety-related electrical equipment was not complete. The licensee will re-submit environmental qualification data at a later date, at which time another audit will be performed.
4.0 REFERENCES
1.
Units 1 and 2 Diablo Canyon Site Pacific Gas and Electric Company Environmental Qualification Report, June 1981.
2.
Interim Staff Position on Environmental Qualification of Saf;'y-Related Electrical Equipment, NUREG-0588.
3.
IEEE Standard for Qualifying Class lE Equipment for Nuclear Power Generating Stations, IEEE Std. 323-1974.
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P h
S APPENDIX A QUALIFICATION DEFICIENCIES FOR INDIVIDUAL EQUIPMENT ITEMS F
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APPENDIX A QUALIFICATION DEFICIENCIES FOR INDIVIDUAL EQUIPMENT ITEMS The legend for entries in the deficiency column is as follows:
A Material aging evaluation, replacement schedules, on-going equipment surveillance M
Margin H
Humidity P
Pressure R
Radiation CS Chemical spray T
Temperature I
Information in submittal incomplete DO Demonstrated operability I
4 J
APPENDIX A QUALIFICATION DEFICIENCIES FOR INDIVIDUAL EQUIPMENT ITEMS Equipment Description Manufacturer Model Deficiency Table 5 i
j (Inside Containment) i 1.
Pressure Transmitter Rosemount 1152 M,A,CS (to be replaced) 2.
Level Transmitter Barton 764 CS,M,A(I) 3.
Pressure Transmitter Barton 763 CS,M,A(l) l 4.
Pressure Sensor Barton 351 CS,M,R,A(I) 5.
Temperature Detector Sostman 11834 B-1 T,CS,00,A 6.
Temperature Detector Sostman 11901 B T,CS,M,A(1) 7.
Fan Cooler Motor Westinghouse 585-5-s T,00 8.
Solenoid Valve ASCO NP831655V M,00,A(2)
(also on Table 6)
NP831655E NP8316E35V
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9.
Valve Motor Operator Limitorque SMB-0,00,000 T,00,A 10.
Limit Switch Namco EA180 M,00,A(2)
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- 12. Solenoid Valve Valcor V526-5295-36 M(2) l
)
- 13. Penetration GE NS02/03/04 T,DO,CS,A,R j
QUALIFICATION DEFICIENCIES FOR INDIVIDUAL EQUIPMENT ITEMS (continued)
Equipment Description Manufacturer Model Deficiency Table 5 (Inside Containment) 14.
Cable Continental Silicon /
T,00,A,CS Sil'~ n
- 15. Cable Boston o
Silicon /Hypalon T,00,A
- 16. Cable Raychem Stilan M,00(2) 17.
Cable Okonite Tefzel M,00,A(2)
- 18. Cable Boston Silicon Glass M,00,T,A(3)
Braid /Kapton/
Hypalon
- 19. Cable Rockbestos Firewall III M,00(2)
- 20. Cable ITT Surprenant DAC-02A-AKP M,00(2)
(Exane II)
- 21. Terr.ination Raychem Sealed splice M,00(2)
- 22. Conductor Seals Conax various (5)
M,00(2)
- 23. Conduit Sealing Assem.
0.Z.
Gedney Various (6)
T,00,CS,M,A(3,4)
Table 6 (Inside Containment) 24 Solenoid Valve ASCO 8316/8321 M,A(2)
(also on Table 9) m
QUALIFICATION DEFICIENCIES FOR INDIVIDUAL EQUIPMENT ITEMS (continued)
Equipment Description Manufacturer Model Deficiency Table 8 25.
Valve Motor Operators Limitorque (Reliance SMC-04 00 Motors)
- 26. Flow Sensors Fischer & Porter 1082496 P8BA 00 (DP Transmitter) 27.
Pressure Sensors Fischer & Porter 50EP1041 BCS T,A l
28.
Valve Actuators ITT General Controls NH92K60 02 E2LBD M,DO(2,3) i l
l
- 29. Cable Okonite EPR/Hypalon Qualified l
%J 30.
Cable Raychem Flametrol (XLPE)
D0 1.
Margin deficiency on operability 2.
Margin deficiency on temperature 3.
Margin deficiency on pressure 4.
Margin deficiency on radiation 5.
Worksheet specifies model #N-11001 1
6.
Worksheet soecifies model #CSBI i
1
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APPENDIX B SUMMARIES OF CENTRAL FILE REVIEWS 8
APPENDIX B SUMMARIES OF CENTRAL FILE REVIEWS Item: Conax Electrical Conductor Seal Assembly Model N-11001 The Conax Conductor Seal Assemblies are used at various locations inside containment as conr.ectors to various devices.
Bounding environmen-tal qualification parameters are identified as maximum temperature (LOCA 272 F, MSLB 344 F), pressure (47 psig), relative humidity (100%), chemical spray (8.8 pH, boric acid and NaOH), and radiation (6.5 x 10 R r.d s ). The required operating time within an adverse environment is 120 days.
The audit of environmental qualification documentation confirmed that a Conax unit similar to those installed at the Diablo Canyon Plant was exposed to environmental conditions which exceeded those listed above by acequate margin. Qualification for temperature, pressure, relative humidity, and chemical spray was by sequential testing. Qualification for operating time and aging was by test and analysis. The analyses presented in the documentation were adequate and are to be confirmed by Wyle Laburatories.
Item:
Boston Fan Cooler Cable, Silicon, KAPT, ASB, and Hypalon.
The Boston fan cooler cable is used to supply power to the containment f an coolers. The cables are installed in steel conduit inside containment.
Bounding environmental qualification parameters are identified as maximum temperature (LOCA 272 F, MSLB 344 F), pressure (47 psig), relative humidity (100%), chemical spray (8.8 pH, boric acid and NaOH), and radiation (6.5 x 10 Rads).
The required operating time within an adverse environment is one year.
The audit of the environmental qualification documentation confirmed that cables similar to those installed at the Diablo Canyon Plaru were exposeo to environmental conditions which exceeded those listed obave by adequate margin with the exception of temperature for the MSLB.
For the 9
1 MSLB the 302 F test-temperature was extended to 344 F by analysis. Quali-fication for. temperature, pressure, and relative humidity was by simultan--
l eous testing. Qualification for chemical spray and radiation was by separate effects testing. Qualification for operating time and aging was by test and analysis. Justification for the separate effects and analysis presented ia the quctification documentation war, adequate pending an independant review of aging and operating time by Wyle Laboratories.
Item:
0.Z. Gedney Conduit Sealing Fittings on Motor Operated Valve i
Junction Boxes.
The 0.Z. Gedney seals are used only on motor-operated valves to pre-i I
vent entry of LOCA environment to the motor operator terminal box.. Bound-ing environmental qualification parameters are identified as maximum temperature (LOCA 2/2 F, MSLB 344 F), pressure (47 psig), relative humidity (100%), chemical spray (8.8pH, boric acid and NaOH), and radiation (6.5 x 7
10 Rads). The required operating time within an adverse environment is
}
120 days.
i The audit of the environmental qualification documentation ir.dicated l
that this type of unit had been tested, as a complete enit, for pressure only. However, the only material in the seal subject to DBE deterioration is the hypalon gasket.
Adequate test reports were present in the documen-tation to show that the hypalon used is qualified per NUREG 0588. The testing and analysis used for the aging qualification is under review by Wyle Laboratories.
Item:
Barton #351 Pressure Sensor.
I The Barton #351 pressure sensor is used to sense containment pressure. =
The associated tran,mitter, located out of containment, fulfills both a trip function as well as a monitoring functior. Bounding environmental qualification parameters are identified as a pressure-(47 psig), temper-atui? (344 F), relative rumidity (100%), chemical spray (8.8 pH, boric 7
i acid and Na0P) and radiation, (2.47 x 10 Rads). The operability nents are 120 days for monitoring and a 5 minute trip function l
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requirement. No submersibility test was identified. Age requirements of 40 years were specified.
The audit of the environmental qualification' documentation revealed.
that a change in fill fluid from water to oil had been made, % t all the test reports were based on water fill. The operability qualification method was by test and analysis, but the analysis was not available yet.
Aging qualification is also pending. The radiation qualification is also based on the water fill and does not address the oil fill.- The test report did not substantiate the qualification claim for-chemical spray.
Item: Valcor Solenoid Valve Model #V 526-5295-36 The solenoid valves are used in containment for post ~LOCA sampling.
The limiting environmental parameters are.344*F (MSLB), 272*F (LOCA),
47 psig, 100% relative humidity. 8.8 pH boric acid Na0H solution chemical 7
spray, 5.5 x 10 Rads (total integrated dose) and'40 year age. Submerg-ence testing is not necessary, osed the onerability requirement is.120 days.
Tne audit of the environmental qualification. documentation indicated that this itam was exposed to environmental conditions that equaled or exceeded those indicated above with the following exceptions. -The aging analysis indicated a 41 year lifetime as long as nonmetalic parts were changed out on a two year cycle. The operability qualifica61on analysis showed a 3.48 year post LOCA lifetime, while the calculated lifetime from the aging analysis was 2.42 years.
The differences in the results, plus lack of adequate margin shov's for aging if LOCA occurs at two years, i; an area of concern on.this item.
Item: Containment Fan Cooler Mo or The containment fan cooler motor is located inside containment at an.
elevation of 140 ft.
Its use is for containment cooling. The bounaing environmental parameters are identified as follows:
temperature (MSLB 344*F, LOCA 272*F), pressure (47 psig), relative humidity (100%), radiation 11
i (5.5 x 10 Rads), a3.ng (40 years), et nical spray (boric acid Na0H solu-tion 8.8 pH).
The required operatino time within an adverse environment is i
one year.
The audit of the environmental qualification documentation confirmed that this item was exposed to compatible environmental conditions to those indicated above with sufficient margin except the post accident operability time of one year. The post accident operability time is for 15 days only.
4 A written note in the files stated that Westinghouse will provide documenta-tion supporting 1 year operability in the future.
For the MSLB the 324 F test temperature was extended to 354 F by analysis.
The qualification method for LOCA temperature, pressure, humidity, and chemical spray was simultaneous testing. The lubricant used is Westinghouse SN# 773A773-605 8
i and was irradiated to 2 x 10 Rads.
j Item: Electro-Hydraulic Actuator (NH92K6002E2L80)
The Electro-Hydraulic actuator is located outside containment and used for auxiliary feed water level control. The limiting environmental quali-j fication parameters are identified as operating time (120 days), temperature (209*F HELB), pressure (atmospheric), relative humidity (100%), radiation 5
(9.13 x 10 Rads), and aging (40 years), with chemical spray not required.
i The audit of the environmental qualification confirmed that the test i
item was exposed to the conditions listed above with sufficient margin with j
the exception of operating time (30 days only). An analysis to qualify.the
(
device for 120' day operability is being performed by Wyle Laboritories. The qualiHcation method used was sequential testing. Sequential testing and analysis was used for the 40 year aging. Of major concern is the fact that during the radiation testing the actuator failed to respond when exposed to 7
{;
3.96 x 10 Rads. This was due to offgassing of the oil caused by radia-tion exposure. A vent hole was drilled in the oil filling plug to relieve i
the gas.
No further problems were encountered during the remainder of the test.
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Even though the radiation exposure exceeds the environmental radiation 5
7 specification (9.13 x 10 rads versus 3.96 x 10 ) the radiation degrada-i tion value was not established for the oil. Oil type is Mobil SHC-824 hydraulic oil.
Also of major concern is the fact that during the steam, temperature, and pressure DBE condition testing the unit would not perform its fail-safe function within the required time. The high pressure relief valve was replaced with a new low pressure solenoid and the low pressure valve was modified. Both were retested (high pressure relief valve.at ambient temper-ature for 30 days--low pressure relief valve at 140-150 F for 15 days).
Both functioned satisfactorily at this time, however documentation was not present to show the unit was qualified, after modification,-for the limit-ing environmental parameters.
The qualification test was performed on test speciman NH91C4069E 1F6 Nil. An engineering report of qualification extension by similarity and analysis was included in the files.
The plant walkdown showed the hole in the oil fill plug was'not pre-sent in the installed equipment. Therefore it cannot be assured that the relief valve modifications are present in the installed equipment..Docu-mentation was not provided to reflect that the above modifications.were performed or present in the equipment installed in the plant.
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