ML19345C810
| ML19345C810 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 11/10/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Rich Smith VERMONT YANKEE NUCLEAR POWER CORP. |
| References | |
| NUDOCS 8012080419 | |
| Download: ML19345C810 (1) | |
Text
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NUCLEAR REGULATORY COMMISSION y
REGION I 8,
631 PARK AVENUE
,#g KING OF PRUSSIA, PENNsYt.VANIA 19406 M
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November 10,19b0 jj Docket No. 50-271 S
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.,3 Vermont Yankee Nuclear Power Corporation
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5 ATTN:
Mr. Robert L. Smith J. ~
r0 Licensing Enctneer j
tM 25 Research Drhe a
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Westborough, Massachusetts 01581 v1 3
m Gentlemen:
The enclosed IE Information Notice No. 80-41, " Failure of Swing Check Valve in
+te Decay Heat Removal System at Davis-Besse Unit No. 1, is forwarded to you for information.
No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, B+oyca H. Grier
.- w^
Director-
Enclosures:
1.
IE Information Notice No. 80-41 2.
List of Recently Issued IE Information Notices CONTACT:
E. G. Greenman (215-337-5267) cc w/encls:
Mr. Warren P. Murphy, Plant Superinte ' dent Mr. W. F. Conway, Vice President and A nager of Operations Mr. J. E. Griffin, President Mr. L. H. Heider, Vice President t
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801208048
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SSINS No.:
6835 Accession No.:
8008220260 UNITED STATES.
IN 80-41 NUCLEAR REGULATORY COMMISSION
[Fs OFFICE OF INSPECTION AND ENFORCEMENT
.b WASHINGTON, D.C.
20555 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 Description of Circumstances:
On October 9,1980 the resident inspector at the Davis-Besse facility was informed that the licensee had performed 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 usti to isolate the reactor coolant system from the low pressure decay heat rescial system.
On further investigation the 1,1censee found that the valve disc and arm had separated from the valve body and was lodged just under the valve cover plate.
The two 2 5/8 x 5/8 inch bolts and locking mechanism for the bolts that,: olds the are 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 tn.?, was in progress when:the failure was identified'was ~being con-t ducted in res:anse 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.
This IE Information Notice is provided as an early notification of a passibly 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 iave any questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
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e IE Information Notice No. 80-41 November 10, 1980 RECENTLY ISSUED IE INFORMATION NOTICES Information Subject Date Issued to Notice No.
Issued 80-40 Excessive Nitrogen 11/6/80 All holders of Supply Pressure a power reactor OL Activates Safety-Relief or CP Valve Operation to Cause Reactor Depressurization 80-38 Cracking in Charging 10/30/80 All holders of Pump Casing Cladding a PWR power reactor OL or CP
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80-37 Containment Cooler 10/24/80 All holders of a Leaks and Reactor power reactor OL Cavity Flooding at or CP Indian Point Unit 2 80-36 failure of Steam 10/10/80 All holders of a Cansrator Supports power reactor -
L OL or CP 80-35 Leaking and Dislodged 10/10/80 All holders of a Icdine-125 Implant Category G or G1 Seeds Medical License 80-34 Baron Dilution of 9/2G/80 All holders of a Reactor Coolant During PWR Power Reactor OL Steam Generator Decontaminction 80-33 Determination of 9/15/80 AIT holders of Teletherapy Timer a teletherapy Accuracy license 80-32 Clarification'of 9/12/80 All holders of Certain Requirements an NRC or Agreement for Exclusive-use State License Shipments of Radioactive Materials 80-31 Maloperation of Gould-8/27/80 All holders of Brown Boveri 480V-Type
~a power reactor K-6005 and K-Don 6005 OL or CP Circuit Breakers e