ML19345C820
| ML19345C820 | |
| Person / Time | |
|---|---|
| Site: | 05000516, 05000517 |
| Issue date: | 11/10/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Chon Davis LONG ISLAND LIGHTING CO. |
| References | |
| NUDOCS 8012080441 | |
| Download: ML19345C820 (1) | |
Text
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[ e u g'o, UNITED STATES
~j NUCLEAR REGULATORY COMMISSION E
REGION 1 o
631 PARK AVENUE
,d'a KINO oF PRUS$1A, PENNSYLVANIA 19406 November 10, 1980 Docket Nos. 50-516 N
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-' l Long Island Lighting Company ATTN:
Mr. Charles P. Davis
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Senior Vice President MM_
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'!3 250 Old Country Road 9.f '
2 Mineola, New York 11501 5
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Gentlemen:
The enclosed IE Information Notica No. 80-41, " Failure of. Swing Check Valve in the 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, Boyce H. Grier Of rector Enciosures:
1.
IE Information Notice No. 80-41 2.
List of Recently Issued IE Information Notices CONTACT:
E. G. Greenman (215-337-5267) cc w/encis:
J. P. Novarro, Project Manager Edward M. Barrett, Esquire Edward J. Walsh, Esquire T. F. Gerecke, Manager, Engineering QA Department 8012().80 N
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SSINS No.:
6835 Accession No.:
8008220260 l
UNITED STATES IN 80-41 NUCLEAR REGULATORY COMISSION 1
0FFICE OF INSPECTION AND ENFORCENENT
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WASHINGTON, D.C.
20555 3
November 10, 1980 IE Information Notice No. 80-41:
FAILURE OF SWING CHECK VALVE IN THE DECAY i
HEAT REMOVAL SYSTEM AT DAVIS-8 ESSE UNIT NO. 1 Description of Circumstances:
On October 9,1980 the resident inspector at the Davis-Besse faciitty was informed that the licensee had performed leak rate tests and identified exces-sive leakage thmugh Decay Heat Removal System check valve CF-30.
Yalve 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 ifcensee fourd 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 l
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 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 > '
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4 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 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.
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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 J
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 Support.
power reactor :;e Bolting OL or CP 80-35 Leaking and Dislodged 10/10/80 All holders of a Iodine-125 Implant Category G or G1 Seeds Medical License 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 ifcense 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 X-Don 6005 OL or CP Circuit Breakers e