ML20106D408
| ML20106D408 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 10/01/1992 |
| From: | Tuckman M DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9210090284 | |
| Download: ML20106D408 (5) | |
Text
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@n3)U1,3C6 fn edYA DUKEPOWER October 1,1992 U.S. Nuclear Regulatory Corninission ATTN: Document Control Desk Washington, D.C. 20555 Subjec*.:
Catawba Nuclear Station Docket Mos. 50-413 and 50-414 R ply To A Notice Of Violation NRC Inspection Report 50 413/92-12 and 50-414/92-18 Attached is Duke Power's response to the Level IV violatie, cited in the Notice of Violation by subject Inspecticn Report dated September 4,1992.
The siolation involved an incorrect operator inspmse for an annunciator.
Very truly yours, N. 3. }
M.S. Tuchnan JLL/
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U U.S. Nuclear Regulatory Commission Octooer 1,1992.
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S.D. Ebneter Regional Administrator, Region II R.E. Martin, ONRR W.T. Orders Senior Resident Inspector i'
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DUKE POWElt CO.hlPANY REPLY TO A NO(:CE OF VIOLATION 413/92-18-02 Technical Specification 6.8.1 requires in part that written procedures be establi3ned, implemented and maintaiaed covming the activities referenced in Appendix A of Regulatory Guide 1.33, Revision 2, February 1978. Operations hianagement Procedure (Oh1P) 1-8, Authority and Responsibility of L':ensed R actor Operators and Senior Reactor Operators, Section 7.2.B, describes the responsibilities of the
, emtor at the Comrols (OATC). Step 7.2.B.9.c requires that the OATC verify that the appropriate automatic actions for an alann have taken place prior to taking recovery tetions.
Contrary to the above, Oh1P l-8 was not followed on July 17, 1992, when the OATC did not verify the appropdate automatic actions when Train A of the Unit i Baron Dilution blitigation hy~em (BDh1S) alanned. The BDh1S actuation caused the suction source of the Centrifugal Charging Pump to swao from the Volume Control Tank (VCT) to the Refueling Water Storage Tank (FWST). The GATC closed the suction valve from the FWST but failed to reopen the suction valve from the VCT. The OATC did not refer to the annunciator response procedure to verify that the automatic actions for 'he BDhtS alann had taken place prior to taking action to recover from the actuation.
This is a Severity Level IV violation and applies to Unit 1.
ItESPONSE:
e 1.
Re;t3nn For Violation This incident is attributed to inappropriate OATC action. The UiTC, believing the BDalS alann to be spurious, acted pre-maturely to restore nonval suction to Charging Pump IB. Upon receiviag the BD51S actuation alaan, the OATC did not immediately refer to the appropriate annunciator response procedure to s erify which automatic actions ha(1 taken place prior to taking recovery action. The appropriate annunciator response procedure was referred to following closure of INV-252 (Charging Pump Suction from FWST). Failure to immediately refer to the appropriate annunciator responst procedum restJ'ed in closing iNV-252 out of sequence.
2.
.Cntrective Actions Taken and Results Achiesed The Boron Dilution N1itigation System (BDSIS) was immediately reset and the affected vahes re-aligned.
I
t DUKE POWER COA 11%NY REPLY TO A NOTICE OF VIOLATION 413/92-18-02 An Inxrvice Pump Test (IWP) was immediately perfonned un Charging Pump lb to assess any oamage incurred as a result of pump operation without a suction source for approximately fony (40) seconds. Upon evaluation of the IWP data, which verifies acceptable net positive suction head, pump head, pump bearing temperatures, and vibration, it was detennined that Charging Pump IB did not sustain any damage and therefore remained operable throughout the period.
Increascu surveillance was put in place, following the IWP test, to monitor Charging Pump IB suction and discharge differential temperature. Charging Pump iB differential temperature peaked at 13.1 degrees approximately seven (7) hours after pump start, and began a downward trend to 10.6 degrees four (4) hours following the peak, wiiich also inc ated no damage to the pump.
An "Operatar Update' was issued on August i1,1992 to remind Licensed Operators cf the need to ensure the NV Pump suction source is maintaiced when a UDhtS alann is received.
A modification to the BDh1S system was initiater.'nd completed during 1EOC6 (current outage) as a result of continuing BDhtS sp.. spurious alanns. This modification grounded the system to station ground, as opposed to instrument ground, therel'y eliminating the induced noise causing these spurious alanns. Following completion of this modification, no funher problems with spurious BDhtS alanus were encountered for the remainder of the outage.
3.
Corrective Actions to be Taken to Avoid Further-Violations The Ooerations Training Department will re-emphasize appropriate BDh1S alann recovery actions in classroom training, and training will be expanded to include an actual BDh1S actuation on the simulator such that the Licensed Operators demonstrate appropriate recovery actions following receipt of a BDhlS alann by April 1,1993.
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I DUKE POWElt COh1PANY ltEPIN TO A NOTICE OF VIOLATION 413/92-1ti.02 A warning tag at the Buh1S " Enable / Bypass" switch will be implemented as a pre-cautionary means for recovery upon receipt of a llDh1S elann. Procedure changes directing tire Licensed Operators on the use of this tag will be completed by Jaauary 1, 1993. These procedure changes will be made to direct the Licensed Operators to place this tag at the BDh1S " Enable / Bypass" switch on the Contro! Room hiotor Centrol Board wh n BDhtS is " Enabled", and removed when BDh1S is "llypassed" The warning tag will state the following:
WARNING BDh15 ACTUATION CAUSES NV PUh1P SUCTION TO SWAP FROel VCT TO FWST 4
Operations hlanagement Procedure (Oh1P) 1-8, Step 7.2.B.9 will be revised to better define management expectations relative to OATC response to abnonnal alanns by April 1,1993.
4.
Ihte of FulLCnmpliatge Duk: Power is now in full compliance.
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