ML20087N871
| ML20087N871 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 03/29/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8404050113 | |
| Download: ML20087N871 (3) | |
Text
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TENNESSEE VALLEY AUTHORITY
-L CHATTANOOGA. TENNESSEE 374ol 400 Chestnot Street Tower II g4 g ?.
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- Q Q March 29, 1984-BLRD-50-438/84 BLRD-50-439/84-22.
' U.S. Nuclear Regulatory Coimaission
-Region'II.
Attn: Mr. James P. O'Reilly, Regional Administrator 101.Marietta Street,' HW, Suite 2900 Atlanta,' Georgia ' 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - OVERPRESSURIZATION OF EMERGENCY RAW COOLING WATER PIPING BECAUSE OF TWO MECHANICAL FAILURES -
- BLRD-50-439/84-23, BLRD-50-439/84 FIRST INTERIM REPORT W
The subject deficiency was initially reported to'NRC-0IE Inspector R.-Carroll on March 1,1984 in accordance with 10 CFR 50.55(e) as NCR 2879.
. Enclosed is our first interim report. - We expect to submit our next report
. by. June 1,- 1984..
If ~you have any questions, please get in touch with R. H. Shell at
' FTS 858-2688..
i Very truly yours,
, TENNESSEE VALLEY AUTHORITY D$
L. M. Mills, Manager Nuclear Licensing EnclosureL cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office' of Inspection and Enforcement U.S. Nuclear-Regulatory Conunission Washington, D.C..
20555 Records Center-(Enclosure).
Institute. of Nuclear Power Operations
' 1100 Circle 75 Parkway, Suite 1500
Atlanta, Georgia 30339
'tittFICIM= C j
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3e PDR g I 1983-TVA SOTH ANNIVERSARY An Equal Opportunity Em' ployer.
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- e ENCLOSURE
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- BELLEFONTE NUCLEAR PLANT. UNITS 1 AND 2
{
OVERPRESSURIZATION OF EMERGENCY RAW COOLING WATER PIPING l
-BECAUSE OF TWO E CHANICAL' MALFUNCTIONS BLRD-50.438/84-23, ELRD-50-439/84-22 NCR 2879 10 CPR 50.55(e)
FIRST INTERIM hEPORT n
Description'of Deficiency
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During, a hydrostatic. test on February -16, 1984, a temporary pressure gauge
'anubber and relief valve failed-and resulted in an overpressurization of a
~u portion of. the essential raw cooling water (ERCW) system. The pressure gauge has been calibrated on February 14, 1984, and was'used to set the relief 2
Lyalve at 235 lb/in s on the came date.
During the hydrostatic. test,.a ' mall' double-acting, air-driven pump was used s
2 to pressurize; the system to 90 lb/in g.. The pressure was then raised to 2
100 lb/in g by several strokes'of the pump and at this time the over -
- pressurized. portion of the system was checked for leaks, with none occurring.
Thelvalve' was opened,:and the pump was started. When the pressure was near 2
2 180 lb/in g, it was noted that-the pressure was increasing at an. excessive
. rate. 'At.that point,_the pump was shut off, and the valve between the pump and test items was ' closed'before the indicated pressure reached 230 2
clb/in g, Due.to 'a-significant lag' in the response of the pressure gauge the pressure
~
-indication ; continued to increase (above 235 lb/in g) and efforts were 2
t
'l
. initiated to.. relieve' the pressure (since the relier valve had apparently
-failed).. The coupling on the relief: valve was loosened and valve 1KE-VJDC-
- 242-B.(see attached sketch) was' opened in the discharge side of the air
. handling unit (AHU).. By the time the pressure was relieved, the ' gauge' had 2
begun to level. off at approximately 480 lb/in g.
Although the coils on AHU
-1VA-MANU-198-B and associated;KE (ERCW) system piping between valves 1KE-'
'VHAC-280-and?1KE-VJDC-242-B were subjected to a pressure estimated at 480 to 2
500 lb/in g,J they are only hydrostatically qualified to a pressure of 300 2
.lb/in g,.
The. valve and pressure gauge were purchased by TVA's Division of Construction as shelf.~ items and are non-quality assurance items.-
U Interim Progress
~
TVA is. investigating the possibility of. damage to the AHU coils due to the ihigher pressure LThe defective pressure gauge will be reworked and the defective valve has' been discarded.
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