ML19345C932
| ML19345C932 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay, Diablo Canyon |
| Issue date: | 11/10/1980 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8012080632 | |
| Download: ML19345C932 (1) | |
Text
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jo, UNITED STATES 7
,o NUCLEAR REGULATORY COMMISSION
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f I REGION V 1990 N. CALIFORNIA 900LEVARD o
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,e SulTE 202. WALNUT CREEIC PLAZA
- ,,,a WALNUT CREE K. CALIFORNIA 94808 November 10, 1980 n
0ccket.los.60-133, 50-275, 50-323
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x Pacific Gas and Electric Company E
77 Seale Street l~b 7
'2 S;n Francisco, California 94106
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Attention: tir. Philip A. Crane, Jr.
T, 3-Assistant General Counsel Gentlemen:
This Information ilotice is provided as an early notification of a possibly significant matter.
It is expected that recipients will review tne infonnation for possible applicability to their facilities.
No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Circular or dulletin will be issued to recorrend or request specific licensee actions.
If you have questions regarding enis matter, please contact the Director of tne appropriate dRC Regional Office.
Si cerely,
/ mk!/
.H.Engekeg irector
Enclosures:
1.
IE Information Notice No. 80-41 2.
Recently issued IE Information Notices cc w/ enclosures:
J. O. Shiffer, PG&E
'd. Raymond, PG&E E. Weeks, PG&E, Humboldt Bay E.13. Langley, Jr., PG&E R. C. Thorncerry, PG&E, Diablo Canyon 1
8012080 43?
SSINS No.: 6835 Accession No.:
8008220260 UNITED STATES IN 80-41 NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT kN WASHItiGTON, D.C.
20555 jg November 10, 1980 IE Information Notice No. 80-41: FAILURE OF SWING CHECK VALVE IN THE DECAY HEAT REMOVAL SYSTEM AT DAVIS-BESSE UNIT NO. 1 Descriotion of Cf reumstances:
On October 9,1980 the resident insoector at the Davis-Besse facility was infonned that the licensee had perfonned leak rate tests and identified exces-sive leakage through Decay Heat Removal System check valve CF-30. Valve cF-30 is the' inboard one of two in-series check valves that is used to isolate c :t reactor coolant system from the low pressure decay heat removal system. On further investigation the licensee found that the valve disc and ann had separated from the valve body and was lodged just under the valve cover plate.
The two 2 5/8 x 5/8 inen bolts and locking mechanism for the bolts that holds the arm to the valve body were missing and have not been located. The CF-30 valve is a 14-inch swing check valve manufactured by Velan Valve Corporation.
The cause of the failure has not been identified.
The test that was in progress when the failure was. identified was being con-ducted in response to a letter from Darrell G. Eisenhut, Office of Nuclear Reactor Regulations to all Light Water Reactor Licensees, LWR Primary Coolant System Pressure Isolation Valves, February 23, 1980.
Tnis IE Information Notice is provided as an early notification of a possibly significant matter that is still under review by the NRC staff.
It is expected that recipients will review the information for possible applicability to their facilities. No specific action or response is requested at this time.
If NRC evaluations so indicate, further licensee actions may be requested or required.
No written response to this IE Information Notice is required.
If you have any questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
.s IN 80-41 November 10, 1980 RECENTLY ISSUE 0 IE INFORMATION NOTICES Information Gate of Notice No.
Subject Issue Issued to 80-40 Failure Of Swing Check 11/10/80 All power facilities Valve In The Decay Heat with and OL or CP Removal System At Davis-Besse Unit No.1 80-39 Malfunctions Of Solenoid 10/31/80 All light water reactor Valves "anufactured By facilities holding Valcor Engineering Corporation power reactor OLs or cps 80-38 '
Cracking In Charging Pump 10/30/80 All PWR facilities Casing Cladding with an CL or CP 80-37 Containment cooler leaks 10/24/80 All nuclear power and reactor cavity facilities holding ficoding at Indian Pcint power reactor OLs Unit 2 or cps 80-36 Failure of Steam 10/10/80 All nuclear power i
Generator Sup; ort Bolting reactor facilities holding power reactor OLs or cps 80-35 Leaking and dislodged 10/10/80 All categories G and Iodine-124 implant seeds G1 medical licensees 80-34 8cron dilution of reactor 9/26/80 All pressurized water coolant during steam reactor facilities generator decontamination holding power reactor CLs 80- 33 Determination of teletherapy 9/15/80 All teletherapy timer accuracy (G3) licensees 80-32 Clarification of certain 8/12/80 All NRC and agreement requirements for Exclu-
' state licensees sive-use shipments of radioactive materials 80-31 Maloperation of Gould-8/27/80 All light water reactor Brown Boveri Type 480 facilities holding OLs volt type K-6005 and or cps K-DON 6005 circuit breakers 1
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- Operating Licenses or Construction Permits
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