ML20235S892
| ML20235S892 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 02/28/1989 |
| From: | Russell L BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8903080058 | |
| Download: ML20235S892 (2) | |
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BALTIMORE i
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GAS. AND ELECTRIC ~
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' CHARLES CENTER '. P.O. BOX 1475. [ BALTIMORE, MARVLAND 21203 LEON B. RUSSELL MANAJER
' CALVERT CLIFFS NUCLEAR POWER P!, ANT DEPAR1 MENT February 28, 1989 zn U. S. Nuclear Regulatory Commission.
Washington, 'DC 20555 ATTENTION:
Document Control Desk-
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos.-50-317 & 50-318 Annual - Report - of ; Failures and Challenges to :PORVs and Safety -- Valves for the Period 'of January 1.1938 through December 31. 1988 Gentlemen:
The documentation of all failures and challenges to pressurizer ' PORVs and safety.
valves for-the period of January 1,
1988, through December 31, 1988, follows. This -
report is ' required by Technical Specification 6.9.1.5.c.
1.
On. April 9,1988, during the - performance of an 18-month surveillance test to ' verify operability of.the Unit 1 PORVs, ERV-402 failed to open.
During the initial investigation,- the ' thermal overloads for its ' supply breaker were found tripped. The overloads were reset and the. test was completed ' satisfactorily.
During subsequent investigation, no abnormal conditions were fcund in that PORV's pilot valve solenoid circuit, and it was concluded that this was an isolated event. The Unit was in HOT STANDBY during this event. No similar events have occurred prior to or since this event.
2.
On June 26, 1988, while raising Reactor Coolant System (RCS) pressure to allow starting a third Reactor Coolant Pump (RCP), the Unit 1 PORY (ERV-402) opened. The PORVs were in the Minimum Pressurization Temperature (MPT) Enable mode (i.e., the lift setpoint was 400 psia 16 Reactor -
Coolant System temperature remained constant at psia]F during the event. Reactor pressure lowered from 400 psia to 395 psia 303 during the time to shut the PORV block valve. Pressurizer spray flow was initiated to lower RCS pressure and shut the PORV. The PORY block valve was re-opened. No MPT limits were exceeded. The event was caused by operator error. The size of the RCS window was a contributing factor to-the event. The RCS window is bounded by the MPT-Enable setpoint, RCS temperature limits and RCP minimum pressure for operation curves.
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8903080058 890228 PDR ADOCK 05000317
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Document Control Desk February.' 28,- 1989 Page 2--
3.
On ' October ' 28,.1988, one pressurizer code safety ' valve's lift setpoint. was found above 'the maximum setpoint during - surveillance testing.'-This event
-is described in LER 50-317/88-11.
- Should you have ' any. further ~ questions regarding ' this ~ matter, we' will be. pleased to discuss' them with you.
Very truly yours, k
LBR/JMO/dtm cc:
D.' A. Brune, Esquire J. ' E.
Silberg, Esquire R. A.Capra, NRC, S. A. McNeil,' NRC.,
W. T. Russell, NRC V. L. Pritchett, NRC T. Magette, DNR 9
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