ML19262E432
| ML19262E432 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 05/21/1980 |
| From: | Russell L BALTIMORE GAS & ELECTRIC CO. |
| To: | |
| References | |
| NUDOCS 8005270428 | |
| Download: ML19262E432 (3) | |
Text
ENCLOSURE 2 May 21, 1980 70:
Mr. 3. H. Grier, Directer Region I, USNRC FRCM:
L. B. Russell, Chief Engineer Calvert Cliffs Nuclear Power Plant
SUBJECT:
Docket No. 50-317; Violation of T1chnical Scecificatien 3.7.1.2, LER 80-25 On May 20, 1980, following a manually initiated trip on the Unit 1 plant due to a degradation of the Service Water System, No.11 Cendensate Storage Tank (CST) was aligned to the suction of the Unit 1 Auxiliary Feed Pumps (AFP) and the Unit 1 suoply valve from No.12 CST was closed. These actions were taken at approximately 8:30 p.m.
Subsequently, at approximately 10:00 p.m., the CST's were realigned to their normal configuration. While taking the routine 1:00 a.m. readings, the Unit 1 Turbine Building Cperator reported to the Senior Centrol Rocm Operator (SCRC) that the suction cressure for the Unit 1 Auxiliary Fred Pumps (AFP) was reading ::ero, indicating that the suction side valve line up was incorrect. The SCR0 directed tne Outside Operator (050) to correct the valve line up tc the AFP suction; apparently the directions given to the 050 at 10:00 p.m. were incorrect and had resulted in the total isolation of Ccncensate Storage frem the Unit 1 AFP's.
The precise sequence of events wnich apparently led to the incorret line uo is as follows:
1.
Following the plant trip, the AFP's were used to restore Steam Generator levels; due to the requirement to maintain a minimum level in No.12 CST, the AFP suction was shifted to No.11 CST at approximately 8:30 p.m.
2.
At accroximat31y 9:30 p.m., a Steam Generator Feed Pumo (SGFP) was started en Auxiliary Steam and the AFP's were shutdown.
3.
At aoproximately 10:00 p.m. the Unit 1 Cent-ol Recm Cperator (CRO) directed a change in valve line uo to restore No.12 CST as the suoply to the Unit 1 AFP's.
In doing so, he incornetly designated the valves to be operated. His directions to tne CSO were given by valve numoer and recorded by the CSO cn his leg sheet; evidently the CR0 had trans::csed tne valve cescriotion for 1-AF4-167 and 1-AFA-161 (See At acned Sketch). This transposition is documented in the Lccked Valve Ceviaticn Leg by the fact that the valve description for 1-AF4-161 and 1-AF4-167 were reversed. The reversal caused 1-AF4-161 to be shut anc 1-AFW-167 to be ocened, instead of t. e ccrrect line us wnich would have 1-AF4-161 coen and 1-AF4-167 shut.
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