ML19345C797
| ML19345C797 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 11/10/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Tallman W PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| References | |
| NUDOCS 8012080375 | |
| Download: ML19345C797 (1) | |
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UNITED STATES 8
NUCLEAR REGULATORY COMMISSION g
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$31 PARK AVENUE
%, *...,e x No oF PRUSSIA, PENNSYLVANIA 19406 November 10, 1980 Occket Nos. 50-443 50-444 Pubite Service Company of New Hampshire
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Mr. W. C. Tallman r:
Chairman and Chief Executive Officer i.
1000 Elm Street
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Nanchester, New Hampshire 03105 555 3
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O The enclosed IE Information Notice No. 80-41, " Failure of Swing Cineck Vafve in the Decay Heat Removal System at Davis-Besse Unit No.1," is famarded to you for information.
No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely,
/.. :
Boyce H. GN er Of rector
Enclosures:
1.
IE Information Notice No. 80-41 2.
List of Recently Issued IE Information Notices CONTACT:
E. G. Greenaan (215-337-5267) cc w/encls:
John DeVincentis, Project Manager l
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SSINS No.:
6835 Accession No.:
8008220260 UNITED STATES IN 80-41 NUCLEAR REGULATORY COPNISSION OFFICE OF INSPECTION AND ENFORCEMENT N
WASHINGTON, D.C.
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][ p 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 DaviseBesse 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 used to isolate the reactor coolant system from the low pressure decay heat removal system. On further investigation the licensee 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 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-i ducted in response to a letter. from Darrell G. Eisenhut, Office of Nuclear ~
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Reactor Regulations to all Light Water Reactor Licensees, LWR Primary Coolant l
System Pressure Isolation Valves, February 23, 1980.
This 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 infonnation for possible appifcability 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.
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IE Information Notice No. 80-41 November 10, 1980 RECENTLY ISSUED IE INFORMATION NOTICES i
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 Op2 ration to Cause Reactor Depressurization 80-33 Cracking in Charging 10/30/80 All holders of Pump Casing Cladding a PWR power reactor OL or CP 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 Generator 1 Support-power reactor -
Bolting OL or CP 80-35 Leaking and Ofslodged 10/10/80 All holders of a Iodine-125 Implant Category G or il Seeds Medical Licensa 80-34 Baron Dilution of 9/26/80 All holders of a Reactor Coolant During PWR Power Reactor OL Steam Generator Decontamination 80-33 Determination of 9/15/80 All 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 Ma1 operation of Gould-8/27/80 All holders of Brown Boveri 480V-Type
'a power reactor K-6005 and K-Don 600S OL or CP Circuit Breakers m,_
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