ML20094G034
| ML20094G034 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 11/03/1995 |
| From: | Terry C TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TXX-95272, NUDOCS 9511090201 | |
| Download: ML20094G034 (5) | |
Text
Log # TXX-95272 P~7 File # 10130
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IR 95-17 C
C Ref. # 10CFR2.201 1UELECTRIC.
- c. t
- c. Ter November 3, 1995 Grom Vkt PresMent U. S. Nuclear Regulatory Commission Attn:
Document Control Desk Washington, D.C.
20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 NRC INSPECTION REPORT NOS. 50-445/95-17: 50-446/95-17 RESPONSE TO NOTICE OF VIOLATION Gentlemen:
TU Electric has reviewed the NRC letter dated October 5, 1995, concerning the inspection conducted by Resident Inspectors Messrs. A.T. Gody Jr..
H.F. Freeman, and Ms. V.L. Ordaz-during the period of July 30 through September 9, 1995. The Inspection Report and attached Notice of Violation were dated October 5. 1995.
The Notice of V1olation describes a failure to follow operating procedures which resulted in lowering the Refueling Water Storage Tank level below the minimum Technical Specification level for operability.
Our response is attached.
0G0077 9511090201~951103 PDR---ADOCK 05000445 Q
EDR,
P.O. Box 1002 GlenRose. Texas 76043 f
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' TXX-95272 Page 2 of 2'.
Please~do'not hesitate to contact'Neil Harris at'(817)'897-5449 to coordinate.any additional information you may need to facilitate closure of this. issue.
l Sincerely.
C. L. Terry By:
f M.
R'. Blevins Plant Manager NSH:nsh Attachment cc:
Mr. L. J. Callan, Region IV Mr. W. D. Johnson. Region IV Resident Inspectors I
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L Attachmen't 1 to' TXX-95272'
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Page 1 of 3 l
RESTATEMENT OF THE NOTICE OF VIOLATION (50-445/95 17; 50 446/95 17)
. During an NRC inspection conducted on. July 30 through September 9, 1995.
one violation of NRC requirements was identified.
In accordance with the i
" General Statement of Policy,and Procedure for NRC Enforcement Actions,"
(60 FR'34381: June 30., 1995). the violation is listed below:
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Technical Specification 6.8.1 requires that written procedures be established, implemented, and maintained covering the applicable procedures-recommended in Appendix A of Regulatory Guide 1.33. Revision 2, February
- 1978, i
Regulatory Guide 1.33, Appendix A, recommends written administrative procedures for operation of the Emergency Core Cooling and Fuel Storage Pool Purification and Cooling Systems.
j Comanche Peak Steam Electric Station System Operating Procedure (S0P)-506,
" Spent Fuel Pool Cooling and Cleanup System," was written to govern the operation of the refueling water purification system and requires in Step 5.12,1.U that Valve "XSF-0025, SFP DEMIN X-02 SFP RET VLV LVG-11, is closed" when performing that portion of the procedure.
- Contrary to the above, while aligning the refueling water purification system to the refueling water storage tank (RWST) on August 3, 1995, licensee operators cross-connected the RWST to the spent fuel pool when they opened Valve XSF-0025, rather than ensuring Valve XSF-0025 was closed as was required by operating Procedure SOP-506. Step 5.12.1.U.
This caused
-the RWST level to decrease below the 95 percent minimum level, as required by Technical Specifications 3.5.4 and 3.1.2.6.
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REPLY TO NOTICE OF VIOLATION (50 445/95 17: 50 446/95 17)
TV Electric accepts the violation. The requested information concerning the violation is provided as follows.
i 1.
Reason for the Violation On' August 3, 1995 while operating the refueling water purification I
system to purify the Unit 1 Refueling Water Storage Tank (RWST), an improper valve lineup resulted in overflowing the Spent Fuel Pool l
(SFP)- X-01 into the fuel pool surface ventilation ducts 'and -
decreasing the RWST level below the minimum value allowed by Technical Specifications due to personnel reading operating: procedure step (s) incorrectly.
Several alarm windows are available to operators to provide warning
'in the^eventhof the RWST draining down. Also, the RWST level is
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Attachme'nt 1;to TXX-95272
, Page-2 of=3-monitored by;the' Plant Computer. :The plant l computer points for RWSTT low level and thef annunciator: windows were set:below the Limiting (Condition for Operations. level, The annunciator, point for the Spent Fuel ~ Pool high level alarm,'was#above.theLbottom of-the~ fuel. pool surface ventilation ducts..These.setpoint. problems caused the annunciators'and plant computer not to alarm prior to RWST low. level Lbeing ' reached'and allowed water to enter the SFP surface ventilation y
ducts without' warning"the operators; nTU Electric has s0bsequently reviewed the event'and concluded-that'
- personnelierror was the' root cause of the' event.
Causal factors
-included; personnel involved in the. evolution wereEnot at the pre-job-
= briefing. water level trending / monitoring.for the Refueling Water-Storage Tank or Spent Fuel' Pool was not performed, self-verification -
for procedure use was less-than adequate and'no annunciation was received throughout the event, j
-2.
Corrective Steos Taken and Results Achieved In response to the decreasing water level in the RWST and water.
entering the SFP ventilation ducts, the following actions were tak'en:
- 1. -
RWST level decrease was stopped by securing the refueling water purification pump and securing the associated valve lineup, 2.
RWST level was restored, and 3.
The Radiation Protection (RP) organization restricted Fuel Building access to minimize the potential of spreading
. contamination during spill contairment and cleanup.
The initial actions mitigated the loss of water-from the RWST and the SFP-and restored the RWST level to Technical Specification requirements.
RP activities assured contamination control during spill cleanup.
3.
' Corrective Steos'Taken to Avoid Further Violation The condition where water could potentially enter the SFP ventilation ducts prior.to the high level setpoint for the SFP being reached, was previously identified in an engineering calculation in December 1992.
As the result of this event, the existing design modification to raise the' elevation of the openings of the SFP ventilation ducts was expedited:and completedt This modification has corrected the physical problem.of the duct openings being lower than the SFP high level l alarm. -The setpoints for the plant computer for RWST Low-Level' alarm. was changed to assure operator notification prior to entering acLimiting Condition of.0perations.
lThe.' applicable operating procedure for the Spent Fuel Pool Cooling' and. Cleanup System was revised toLinclude independente verification
.for single barrier valves. 'Several;other Operations procedures were.
- modified to' assure guidance for water transfer.and RWST level alarm
o At%chme'nt1toTXX-95272 Page 3 of 3' updates. The Shift Managers conducted meetings with members of their crews to discuss performance items that led to the event and to clarify / reinforce expectations.
Operations issued a Lessons Learned on the event which includes Management's expectations concerning monitoring evolutions, self-verification and maintaining questioning attitudes.
A temporary local measuring device has been installed in the SFPs to permit local determination of level changes which will be monitored twice per shift when there are no evolutions in progress, and once per hour when activities are being performed which could cause pool level changes. A video camera has been placed in the Fuel Building and connected to a video terminal in the Control Room to allow for remote monitoring of the X-01 Spent Fuel Pool level until permanent local SFP level measuring device (s) have been installed.
These permanent modifications are in progress at this time.
4.
Date of Full Comoliance TV Electric is in full compliance at this time.
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