ML20137C242
| ML20137C242 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 03/17/1997 |
| From: | Peckham M NEBRASKA PUBLIC POWER DISTRICT |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NLS970052, NUDOCS 9703240191 | |
| Download: ML20137C242 (3) | |
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COOPER NUCLEAR STATION P.O. BOX 96. BROWNVILLE. NEBRASKA 68321 Nebraska Public Power District "M"M&""
NLS970052 March 17, 1997 U.
S.. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C..
20555-0001
Subject:
Special Report Pursuant to Technical Specifications 3.15.B and 3.15.C.2 Cooper Nuclear Station, NRC Docket 50-298, DPR-46 Gentlemen:
On March 1,
1997 at 1900, the electric-driven fire pump (FP-P-E) at Cooper Nuclear Station (CNS) was made INOPERABLE due to a bearing failure.
This required entry into Technical Specification 3.15.B, which requires that the condition either be corrected and the system returned to OPERABLE status within seven days, or a special report be submitted to the Nuclear Regulatory Commission (IEC) within the next 30 days outlining the plans and procedures to be used to provide for loss of redundancy in the fire protection system. However, on March 15, 1997 at 1200, the diesel-driven fire pump was made INOPERABLE due to a loss of voltage in both banks of the starting batteries. Because the electric-driven fire. pump had not been restored to OPERABLE status at this time, entry into Technical Specification 3.15.C was required.
This Technical Specification j
states, in part that backup fire suppression be provided and a special report l
to the NRC be submitted in writing no later than the first working day following the event, outlining the action taken, the cause of the inoperability and the plans and schedule for restoring the system to OPERABLE status. The information provided below meets both the 30-day and the first working day following the event reporting requirements.
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Cause of the Incoerability Flow for the CNS Fire Suppression Water (FSW) System is provided by one electric-dri.ven pump (FP-P-E) and one diesel-driven pump (FP-p-D).
An additional non-i Technical Specification electric pump (FP-P-C) is available as an installed backup. The Fire Water Pumps auto-start on low fire water header pressure. An electric jockey pump maintains the header pressurized to prevent inadvertent pump starts. The backup fire pump FP-P-C was available for automatic operation and
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capable of providing Technical Specification flow and pressure requirements at j
this time.
On March 1,
1997 at 1900,-the electric-driven fire pump (FP-P-E) was made INOPERABLE due to overheating of the pump during low flow operation. This required entry into Technical Specification 3.15.B.
Post event troubleshooting
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revealed'a bearing failure.
Initially, it was believed that the bearing failed due to the overheating event However, the bearing failed due to water intrusion.
The overheating cr the pump occurred due to the setpoint for the f
I minimum flow relief valve being too high, c
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!{LS 970052 March 17, 1997 Page 2 On March 15, 1997 at 1200, the diesel-driven fire pump (FP-P-D) was made INOPERABLE due to loss of voltage in both banks of the starting batteries. This condition required entry into Technical Specification 3.15.C due the loss of both FP-P-E and FP-P-D.
l Action Taken Electric-driven fire pump FP-P-E has been restored to Available status as of 1538 on March 15, 1997; however, thir pump requires the relief valve to be reset prior to being declared OPERABLE. The diesel-driven fire pump FP-P-D requires replacement of both banks of starting batteries and replacement of the battery charger control card.
The batteries have been replaced as of March 15, 1996.
The Control Room crew was cognizant of the FSW System status and was capable of
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manually initiating the system, if needed. The NRC was informed of the event associated with FP-P-D by a required 24-hour telephone notification 1722 on March l
15, 1997.
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Plans and Schedule for Restorina System to Onerability As discussed in the previous paragraph, fire pump FP-P-E requires the relief valve to be reset prior to being declared OPERABLE; however, it is capable of 1
providing Technical Specifiewion flow and pressure in the event of a fire. This action is expected to be emipleted by March 19, 1997.
A replacement battery charger control card associated with Fire pump FP-P-D is currently unavailable for immediate delivery. A temporary modification to install portable battery chargers is being pursued and expected to be implemented by March 19, 1997 At the present time, FP-P-D would be capable of a local manual start upon the reinstallation of a battery lead. The charger control card will be replaced and j
the temporary modification removed as soon as practicable.
Completion of the above plans will allow both fire pumps to be returned to OPERABLE status.
Sincerely,
/
(C M.
F.
Peckham Plant Manager
/dnm Enclosure cc:
Regional Administrator INPO Records Center USNRC - Region IV Senior Project Manager W.
Turnbull USNRC - NRR Project Directorate IV-1 MidAmerica Energy Senior Resident Inspector i
USNRC NPG Distribution
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.l ATTACHMENT 3 LIST OF NRC COMMITMENTS l
Correspondence No: NLS970052 The following table identifies those actions committed to by the District in this document.
Any other actions discussed in the submittal represent intended or planned actions by the District. -They are described to the NRC for the NRC's information and are not regulatory j
commitments. Please notify the Licensing Manager at Cooper Nuclear Station of any questions 1
regarding this document or any associated regulatory commitments, i
COMMITTED DATE COMMITMENT OR OUTAGE-None N/A s
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1 1
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. PROCEDURE NUMBER 0.42 l
R6 VISION NUMBER 4 l
PAGE 8 OF 9 l
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