ML20076A906
| ML20076A906 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 07/27/1983 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-83 10CFR-050.55E, 10CFR-50.55E, NCR-1891, NUDOCS 8308180387 | |
| Download: ML20076A906 (2) | |
Text
.
TENNESSEE VALYRC Pn]On ~1 AUTHORITY CH ATTANOOG A, Tj(fftJ E6pEQ 374d O 400 Chestnut Street' Tower II RGIA i
O 29 P
.Q7 BLRD-50-438/82-52 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW Suite 2900 Atlanta, Georgia 30303
Dear Mr.-O'Reilly:
BELLEFONTE NUCLEAR PLANT UNIT 1 - FAILED VALVE CONTROL UNIT -
i BLRD-50-438/82 FOURTH INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector H. V. Crlenjak on July 27, 1982 in accordance with 10 CFR 50.55(e) as NCR 1891. This was followed by our interim reports dated August 25, and October 20, 1982 and January 24, 1983 Enclosed is our fourth interim l
report.. We expect to submit our next report by November 23, 1983 We consider 10 CFR Part 21 applicable to this deficiency.
If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, l
TENNESSEE VALLEY AUTHORITY DS h 1
'j L. M. Mills, Manager Nuclear Licensing i
Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 j
l 1
8308190387 830727 DFFICIAE COPY 1
PDR ADOCK 05000438 S
. An Equal Opportunity Employer Af
4
- 5...
3 ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 1 FAILED VALVE CONTROL-UNIT NCR 1891 BLRD-50-438/82-52 10 CFR 50.55(e)
FOURTH INTERIM REPORT
' ~
Description #of Deficiency The large expansion valve control unit, supplied by Air Conditioning, Refrigeration and Combustion, Incorporated (ARC) of Knoxville, Tennessee, and manufactured by Dunham-Bush, for the water chiller (1VE-MCHL-172-B) in the Auxiliary Building Air Conditioning System failed. This item regulates the refrigerant to the chiller which provides cooling for safety-related equipment.
The control unit is an electronic device with a limited shelf-life.
Failure appears to be attributable to three to four years of inactivity of the electronic parts inside the sealed control unit.
This problem has occurred on one other unit, and we believe that this condition could be a generic problem for all of these chillers.
Interim Progress The vendor has replaced the defective control unit with a working one and TVA has requested that an analysis be performed to determine the cause of the failure, the internal components that failed.and what actions would be taken to prevent recurrence.
A l
t
(
I
.