ML18153A510
| ML18153A510 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 03/28/1997 |
| From: | Ohanlon J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9704070304 | |
| Download: ML18153A510 (4) | |
Text
e VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 March 28, 1997 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNITS 1 AND 2 Serial No.
NL&OS/GDM Docket Nos.
License Nos; EMERGENCY POWER FOR THE SPENT FUEL POOL COOLING PUMPS 96-507B R2 50-280 50-281 DPR-32 DPR-37 By letter dated November 27, 1996 (Serial No. 96-507A), Virginia Electric and Power Company provided information regarding repowering the spent fuel pool (SFP) cooling pumps at Surry Power Station from an emergency power source. We noted in our letter that we were preparing a detailed evaluation to finalize the engineering design and implementation plan for providing emergency power to the SFP cooling pumps and would inform the NRC of our proposed design by February 28, 1997.
Two additional questions regarding our November 27, 1996 response were received from Mr. G. E. Edison of the NRC in a telephone conversation with Mr. D. A. Sommers of my staff on February 21, 1997. It was agreed to combine our response to these two additional questions with our follow up letter on proposed design.
The combined response was to be submitted to the NRC by March 28, 1997. Our combined response is provided in the attachment.
Our evaluation has been completed, and a project scope of work and schedule have I been developed for this effort.
The selected modification will replace the non-
/
emergency power feeds to the SFP cooling pumps with seismically supported power
.)
feeds from emergency (i.e., backed up by the emergency diesel generators) motor control centers. Overall SFP cooling system reliability will be increased since the SFP cooling pumps will be maintained during a station loss of offsite power event. The emergency power feeds to the SFP cooling pumps will be installed by the end of 1999.
/5VJ J As noted in our previous letter referenced above, we believe that preparation of a backfit analysis for this issue by the NRC is no longer necessary, since we will be providing emergency power to the SFP cooling pumps.
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Tile commitments made in this letter are noted below. If you have any questions or require additional information, please contact us.
Very truly yours,
~POYlo-.L James P. O'Hanlon Senior Vice President - Nuclear Attachment Commitments made by this letter:
- 1.
The emergency power feeds to the SFP cooling pumps will be installed by the end of 1999.
- 2.
To further enhance personnel sensitivity to SFP cooling issues, training will be provided to licensed operators in 1997 as part of the licensed operator requalification program. The training will address industry issues related to spent fuel pool
- cooling, as well as the procedural requirements for maintaining/regaining spent fuel pool cooling during a loss of Unit power.
cc:
U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, N. W.
Suite 2900 Atlanta, Georgia 30323 Mr. R. A. Musser NRC Senior Resident Inspector Surry Power Station Response to NRC Request for Additional Information Provision of Emergency Power to the Spent Fuel Pool Cooling Pumps Surry Station Units 1 and 2 NRG Question No. 1 It was stated in a letter dated November 27, 1996, that Surry has implemented "additional procedural controls" that provide for further actions to be taken to restore cooling to the spent fuel pool in the event of a loss of offsite power, but no specific examples of these controls were provided. What specific actions other than lowering the high temperature alarm setpoint, have been taken in this regard?
Response
The station abnormal procedure for a loss of Unit power was revised to add steps to check that SFP cooling is available in the event of a loss of Unit power, as well as the actions to be taken if SFP cooling is not available. Specifically, upon verification of a loss of spent fuel pool cooling due to a loss of Unit power, operations is directed to begin monitoring the SFP temperature by control room temperature indication and determining the SFP heatup rate.
They are also directed to review the applicable annunciator response procedure for high-high spent fuel pit temperature which provides additional guidance for responding to a loss of SFP cooling using alternate cooling (feed and bleed) from the blender, fire main (which can be supplied by a diesel-driven pump), or primary grade water. Procedural guidance in the abnormal procedure also includes consideration of initiating feed and bleed of the SFP prior to receipt of the temperature alarm, providing alternate power for a SFP cooling pump, and/or crosstieing 480V buses to repower a SFP cooling pump on partial loss of power.
NRG Question No. 2 It was also mentioned that there is an increased sensitivity of personnel to spent fuel pool issues and the planned modification to provide emergency power to the spent fuel pool cooling pumps.
What specifically has been done at Surry to increase the sensitivity to these issues?
Response
The planned and completed actions discussed below will ensure that appropriate station personnel are cognizant of and sensitive to SFP issues in general, as well as to the new SFP cooling pump power arrangement when installed.
Training - Technical Staff Continuing Training was provided to applicable personnel which discussed the recent issues at Millstone Unit 1 regarding the concerns with spent fuel pool (SFP) cooling, as well as a discussion of Surry SFP cooling requirements and restrictions.
In addition, the Nuclear Control Room Operator Development Program Training Manual for the SFP cooling system discusses various industry events associated with SFP cooling.
The manual includes examples of industry events regarding spent fuel pool cooling incidents including one example in which SFP cooling was lost for several hours.
To further enhance personnel sensitivity to SFP cooling issues, training will be provided to licensed operators in 1997 as part of the licensed operator requalification program.
The training will address industry issues related to spent fuel pool cooling, as well as the procedural requirements for maintaining/regaining spent fuel pool cooling during a loss of Unit power.
Required Reading - The revised abnormal procedure discussed in the response to Question No. 1 above has been placed in the Required Reading program for operations personnel to ensure they are familiar with the requirements for responding to a loss of SFP cooling due to a loss of Unit power.
Design Change Review - Station management has approved the development of a design change for providing emergency power to the SFP cooling pumps. Furthermore, the design change implementation process requires operations review of the 30% and 70% draft design change packages to identify any operations considerations or concerns with the modification.
(Other departmental reviews are also performed including system engineering, maintenance, training, etc.) An operational readiness review (ORR) will also be performed once the design change has been implemented.
The ORR requires operations review and acceptance of the modification. This ensures that the operations department is aware of the new power source for the SFP cooling pumps, as well as any new operating requirements, procedure changes or training that may be required. This process ensures that departmental responsibilities associated with the completed modification are fully understood and accepted by the responsible personnel prior to placing the modified system into service.