ML20211M018
| ML20211M018 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 10/07/1997 |
| From: | Starkey R COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 295-123-97-001, 295-123-97-1, ZRA97047, NUDOCS 9710100318 | |
| Download: ML20211M018 (3) | |
Text
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ZRA 97047 October 7,1997 U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 h
l Attn: Document Control Desk l
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Subject:
0A Motor Driven Fire Pump Inoperable Greater than Leven Days Zion Nuclear Power Station Unit 1 and Unit 2 NRC Docket Nos. 50-295 and 50-304 The enclosed Special Report number 295-123-97-001SR from Zion Generating Station is being transmitted to you in accordance with Zion's Administrative Technical Requirements Section 3.21.2.B, which requires submittal of a special report witnin thirty days following the inoperability of one or more required fire pumps for more than 7 days.
Sincerely, f-
,J W S. Starkey
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Station Manager Zion Station llh RSS/MW/
Enclosure:
. Special Report 295-123-97-001SR for inoperability of the OA Motor
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Driven Fire Pump 9710100318 971007 PDR ADOCK 05000295 S
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Region ill Administrator.
Zion Senior Resident inspector Station Manager 1
Site Engineering Manager Operating Manager.
Fire Marshal Regulatory Assurance Manager Nuclear Licensing Administrator-Site Quality Verification Director Regulatory Assurance File Master File SRB-
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Enclosure (1)
Zion Station Special Report No. 295-123-97 001SR This report is submitted in accordance with Administrative Technical Requirement 3.21.2.8, which requires submittal of a "Special Report to the NRC outlining the plans and procedures to be used to provide for the loss of redundancy in the fire protection system" due to the inoperablity of the OA Motor Driven Fire Pump.
Based on the following considerations, the backup systems provide adequate safety margin during the loss of the OA Motor Driven Fire Pump. As a result, no special procedures or additional equipment were required.
On September 4,1997 at 12:46 pm, the OA Motor Driven Fire Pump was declared inoperable due to pin hole leaks identified on the pressure regulating relief valve, OFP0052. Duiing the course of the next seven days, the relief valve was replaced and a procedure (SOI-65X, Adjusting Motor Driven Fire Pumo Relief Valve OFP0052 Setpoint) was written to set and test the new valve to criteria which existed in PT 202 0A (OA Fire Protection Pump Capacity Test).
The acceptance criteria utilized from PT-202 0A in writing SOI 65X needed to be re-evaluated due to a step in the procedure which required the operators to interpret when the relief valve is l
closed, however, there is no physicalindication of the valve diaphragm position. This requires l
the operators to interpret valve closure by watching the drain for water flow. No water flow through the drain would be conclusive of valvo closure, however, the design of the relief valve is such that the valve may be closed (i.e. the diaphragm is seated) cnd water flow will still be indicated from the drain. This is due to the regulator still being open. Past performance of this test had allowed operator interpretation of valve closure based on the change in water flow from the valve drain.
With the recent implementation of absolute acceptance criteria, procedural steps needed to be developed which would provide adequate guidance to the operator performing the test without the requirement for interpretation of valve closure based on the change in water flow, in order to remove this subjective conclusion from SOI 65X, the procedure was rewritten to ensure OFP0052 would still maintain the same 145-150 psig system pressure when fully open, and the valve would provide conclusive evidence of full closure (no leakage) prior to the system reaching 125 psig (as required in the Fire Protection Report). The 7-day clock for the OA fire pump expired during the revision of SOI-05X. Following completion of this revision,0FP0052 was successfully tested during the performance of SOI-65X and the OA Fire Pump was returned to service on 9/13/97 at 1748 following the performance of PT-201 (Monthly Check Sheet For Fire Suppression Water System).
During the period of September 4,1997 to September 13,1997, while the OA Motor Driven Fire Pump was unavailable, norma!' ire protection water was provided by the station OA service water booster pump. The 08 Diesel Driven Fire Pump was also available and would have started and maintained system pressure if needed. In addition to the diesel fire pump, the station service water pumps were available to supply water to the fire protection headers.