ML20155D271
| ML20155D271 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 06/07/1988 |
| From: | Shawn Smith TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 88-11, NUDOCS 8806150052 | |
| Download: ML20155D271 (2) | |
Text
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TENNESSEE VALLEY AUTHORITY Sequoyah Nucloar Plant Post Office Box 2000 Soddy-Daisy, Tennessee 37379 June 7',
1988 U. S. Nuclear Regulatory Convoission Document Control Desk Washington, DC 20555 Gentlemen:
TENNESSEE VALLEY AUTHORITY - SEQUOYAH NUCLEAR PLANT UNIT 2 - DOCKET NO.
50-328 - FACILITY OPERATING LICENSE DPR SPECIAL REPORT 88-11 The enclosed special report provider details concerning missed fire watch routes due to airborn radiation developed in the Auxiliary Building unexpectedly. This event is reported in accordance with action statement (b) of Limiting Conditions for Operation 3.7.12.
i Very truly yours, TENNESSEE VALLEY AUTHORITY S.
mi h Plant Manager Enclosure ec (Enclosure):
J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Commission Suite 2900 101 Marietta Street, NW
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Atlanta, Georgia 30323 Records Center Institute of Nuclear Power Operations Suite 1500 1100 Circle 75 Parkway Atlanta, Georgia 30339 NRC Inspector, Sequoyah Nuclear Plant i
l 8806150G52 880607
((12 PDR ADOCK 05000327 S
nrn An Equal Opportunity Employer
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SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 SPECIAL REPORT 88-11 DESCRIPTION OF CONDITION On May 17, 1988, with unit 1 in cold shutdown (0 percent power, 1.5 psig.
124 degrees F) and unit 2 in mode 1 (45 percent power, 2235 psig, 556 degrees F), the 0300 and 0400 hourly fire watch required by Technical Specification (TS) Limiting Condition for Operation (LCO) 3.7.12 was not performed due to airborr. radioactivity developed in the Auxiliary Building unexpectedly. A leakage in the Auxiliary Building, elevation 669 (holdup tank valve gallery), occurred when unit 2 Operacions personnel attempted to letdown the volume control tank (VCT) to holdup tank (HUT) B in order to make allowances for a unit 2 reactor coolant dilution. The operator was unable to readily open the valve which resulted in system pressur;mation and leakage through the valve diaphragm in the valve gallery.
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CAUSE OF CONDITION The shift operations supervisor decided to initiate an Auxiliary Building evacuation at 0250 EDT due to leaking valves in the holdup tank valve gallery.
Fire watch personnel werc not allowed to enter Auxiliary Building due to overriding safety concerns caused by airborn radioactivity in the Auxiliary Building.
ANALYSIS OF CONDITION This special report is required by the action statement b of TS LC0 3.7.12.
The fire watches are being performed as compensatory measure for the Appendix R program. The 0200 and 0600 EDT fire watches were performed, and no fires occurred during this time. The areas which t.he fire watch includes all have fire detection capabilities. A fire would be detected and i
suppressed by automatic or manual action, l
CORRECTIVE ACTION At 0536 EDT, access into Auxiliary Building was permitted, and fire watch personnel resumed fire watch activities immediately.
COMMITMENT None.
0980Q
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