ML19340E097
| ML19340E097 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 11/10/1980 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Bryan J UNION ELECTRIC CO. |
| Shared Package | |
| ML111661417 | List: |
| References | |
| NUDOCS 8101060385 | |
| Download: ML19340E097 (2) | |
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GLEN ELLYN. ILLINOIS So137 November 10, 1980 Those on Attached Address Listing:
This IE Information Notice No. 80-41 is provided as an early notification of a possibly significant matter.
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 further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or request specific licensee actions.
If you have questions regarding this matter, please contact the this office.
Sincerely, W
Y James G. Keppler /
Director
Enclosure:
IE Information Notice No. 80-41 cc w/ enc 1:
Mr. D. W. Kane, Sargent & Lundy Mr. Gary N. Wright, Chief Division of Nuclear Safety Reproduction Unit NRC 20b a la l o e o STS Q
RIII's CORPORATE ADDRESSES FOR OPERATING LICENSEES AND CONSTRUCTION PERMIT HOLDERS (BWR's and PWR's)
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Docket No. 50-346 Toledo Edison Company ATTN:
Mr. Richard P. Crouse Vice President Nuclear Edison Plaza
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300 Madison Ave.. e 2:
Toledo, OH 43652 Sj
[;s cc w/ enc 1:
N Mr. T. Murray, Station ed;
[{fj Superintendent Central Files 03
~S Director, NRR/DPM 5
Director, NRR/ DOR S?
AEOD Resident Inspector, RIII PDR Local PDR NSIC TIC Harold W. Kohn, Power Siting Commission Helen W. Evans, State of Ohio Docket No. 50-483 Docket No. 50-486 Union Electric Company ATTN:
Mr. John K. Bryan Vice President - Nuclear P. O. Box 149 St. Louis, MO 63166 cc w/ enc 1:
Mr. W. 9. Weber, Manager, Nuclear Construction Central Files Director, NRR/DPM Director, NRR/ DOR PDR Loc PDR NS Region I & IV l
Ms. K. Drey l
Mr. Ronald Fluegge, Utility Division, Missouri Public I
Service Commission 1
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SSINS No.
6835 Accession No.:
8008220260 UNITED STATES IN 80-41 NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT 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 performeu 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-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.
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 reviaw 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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