ML19344E884
| ML19344E884 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 08/08/1980 |
| From: | Andognini G BOSTON EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 80-185, IEB-80-17, NUDOCS 8009120036 | |
| Download: ML19344E884 (4) | |
Text
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=TE=oE=T NUCLEAN OPENATIONS DEPARTMENT BECo Ltr. #80-185 Mr. Boyce H. Grier, Director Office of Inspection and Enforcement Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA.
19406 License No. DPR-35 Docket No. 50-293 Response to Supplement No. 1 to IE Bulletin 80-17
Dear Mr. Grier:
This letter provides you with Boston Edison Company's response to Supplement #1 of IE Bulletin #80-17, dated July 18, 1980. Our response to Item #1 is not in-cluded at this time, as verification to the "as-built" design of the SDV system and associated vent and drain systems has not been fully completed.
This fact was brought to the attention of the IE and NRR staff members it, attendance at the August 5, 1980 meeting held at the Region I office in King of Prussia. As discussed and agreed to at this meeting, we will supply the requested isometric drawings with the analysis of SDV System adequacy as well as responses to the specific questions generated by your staff during the meeting, by August 12, 1980.
The following are our responses to Section A Items #2-5 of the subject bulletin:
Item 2 Revise and implement Operating Procedures as necessary to provide clear guidance to the licensed operator in the control room regarding when he should initiate the SLCS without obtaining prior supervisory approval. Provide a description of the impletaented procedural requirements.
Response
Station Procedure 5.3.2 " Inability to Shutdown with Control Rods," Revision 6 dated July 16, 1980, already contafas clear guidance to control room personnel concerning initiation of SLCS. The following is an excerpt from Procedure 5.3.2.
A.
If the control rod system is unable to maintain the reactor in a suberitical condition and one of the following conditions exist: RPV water level cannot be maintained, or suppression pool water temperature cannot be maintained below the temperature scram limit:
- 1. Initiate Standby Liquid Control (SLC), injecting the entire tank volume.
- 2. Confirm the Reactor Water Cleanup System (RWCU) isolates or manually isolate it.
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- 3. Restart the recirculation pumps at minimum flow to aid neutron absorber mixing.
B.
Do not depressurize the reactor.
Stop auto blowdown if r.ecessary.
C.
Notify the "on-call individual" or designated alternate.
D.
Notify the NRC within one hour. At that time, establish and maintain an open continuous communications channel with the NRC.
E.
If the problem can be identified, initiate repairs as soon as possible.
F.
When the Standby Liquid Control System is utilized, inject the full charge to achieve a sufficient volume to attain and maintain suberiticality.
G.
Maintain surveillance of the standby liquid control tank level and shutdown the injecticn pumps upon depletion of the solution.
H.
Maintain normal or low water level.
Stop the FW and CRD pumps if necessary to keep water level normal.
Subsequent Operator Action "Following Poison Injection" A.
Utilize the main condenser to depressurize the reactor, or use the HPCI System in test mole if the MSIV's are closed.
B.
Monitor neutron flux as indicated by the SRh' System.
C.
Close the MSIV's and initiate the RHR Coolant System when the reactor pressure decays to less than 75 psig.
D.
Maintain the nuclear poison (Sodiam Pentaborate) in the vessel entil control rod insertions and repairs are complete.
Discussion When a planned shutdown or reactor scram does not maintain subcriticality, due to control rod insertion failure, the Standby Liquid Control System shall be utilized to effect shutdown and maintain suberiticality.
The Standby Liquid Control System is comprised of dual positive displacement pumps which will inject the solution into the reactor at a rate of at least 39 GPM each.
The total injection will take about 1 15 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br />.
The liquid poison solution will not carry out with steam, so in order to
-maximize the solution in the vessel, the operator should not use the RWCU System reject to maintain level.
Until the injection of the Liquid poison solution is complete, the temperature of the Vessel Coolant System should not be reduced.
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t CTXTCN EDI ON COMPANY Mr. Boyce H. Grier August Page 3 Item 3 Assure that procedures exist and are implemented for specifying remedial action to be taken if water is found in the SDV system at times when it should be free of water. Provide a description of the implemented procedural requirements.
Response
Station Procedure 2.1.6, " Scram Recovery, " Revision 9, dated August 4, 1980, has been revised to require purging air through the 1 inch vacuum breakers / check valves attached to the 6 inch scram discharge East & West headers after the scram is set and the " scram discharge volume high level" alarm is clear.
In addition, instructions have been written in the Chief Operating Engineer's Log Book to blow air through the headers if the results of the daily UT test show residual water.
Once the system to continuously monitor water levels in all scram discharge volume is installed, these actions will be incorporated into the procedures dev-eloped for that system.
Item 4 Revise and implement administrative procedures as necessary to ensure that the SLCS key shall be readily available to the licensed operator in the control room. Prc-vide a description of the implemented procedural requirements.
Response
Pilgrim Nuclear Power Station policy has always been to have the key to the SLCS readily available to the operator.
The keys are located on a hook on the main control board directly above the $LCS control switch.
Item 5 Continue daily monitoring of water levels in all scram discharge volumes until con-l tinuous monitoring system (s) (discussed in B.1 below) is (are) installed and opera-tional (this requirement supersedes the requirements of Item 5 of IE Bulletin 80-17 l
which required daily surveillance for only 6 days).
Response
Daily UT m >nitoring for residual water in all scram discharge volumes is continuing at Pilgrim Nuclear Power Station.
If during your review of the above information you should have any questions or concerns, please do not hesitate to contact us.
Very truly yours, fg nf wa--
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CSCTON EDIZON COMPANY Mr. Boyce H. Grier August Page 4 Commonwealth of Massachusetts)
County of Suffolk
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Then personally appeared before me G. Carl Andognini, who, being duly sworn, did state that he is Superintendent - Nuclear Operations Department of Boston Edison Company, the applicant herein, and that he is duly authorized to execute and file the submittal contained herein in the name and on behalf of Boston Edison Company
- and that the statements in said submittal are true to the best of his knowledge and belief.
My Commission expires:
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