ML20149H796
| ML20149H796 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 12/19/1994 |
| From: | Hunger G PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9412300003 | |
| Download: ML20149H796 (4) | |
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- PECO ENERGY.
recoe er9,com9ex Nuclear Group Headquarters -
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965 chestert> rook Boulevard..
Wayne, PA 19087 5691 December 19,1994 Docket No. 50-352 License No. NPF-39 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555
SUBJECT:
Limerick Generating Station, Unit 1 Technical Specliications Change Request No. 94 041 Extended Allowed Outage Time Gentlemen.
By letter dated June 10,1994, PECO Energy Company (PECO) submitted a Limerick Generating Station (LGS), Unit 1, Technical Specifications (l'S) Change Request (i.e.,94-04-1) that proposed a temporary increase to the Allowed Outage Times (AOTs) for the Emergency Service Water (ESW)
System; the Residual Heat Removal Service Water (RHRSW) System; the Suppression Pool Cooling, the Suppression Pool Spray, and the Low Pressure Coolant injection (LPCI) modes of the Residual Heat Removal (RHR) System; and the Core Spray (CS) System.
On December 7,1994, PECO received a request for additional information from the NRC pertaining to the subject change request. The following are the six NRC questions and the PECO response to each question.
Generic to the questions stated below, PECO is providing specific guidance and controls to operating personnel, pertaining to the planned modifications and proposed extended AOT evolution.
This guidance and control is in the form of wcrk shift briefings, prerequisites, verifk:ations, and emergency guidance which are all contained in LGS Special Procedure SP-152.
Question 1 -
In several instances, valves are to be blocked to avoid single failure vulnerabilities.
How is this to be done, and is it proceduralized? (e.g., page 6 of attachment to application)
Response -
The LGS Clearal.ce and Tagging Manual is the document that provides guidance for blocking. In addition, specific guidance for this blocking evolution is provided by SP-152 step 7.3.10.
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December 19,1994 Page 2 Question 2 -
What is the [*B'] ESW modification that wlN assure High Pressure Coolant injection System (HPCI) opereb81ty?
Response-LGS Modification P@212 wil permanently eliminate the need for ESW as a HPCI support system. Modification P-00212 wRI allow the HPCI equipment compartment to tolerate a higher room temperature while maintaining the operabilty of the HPCI System; therefore, the ESW wul not be required for HPCI room cooling. The ESW System wSI not be modified in support of P 00212.
Ouestion 3 -
WRI the Licensee commit to taking steps to minimize the number of surveNiances
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performed during the extended AOT period?
t-Response -
PECO has committed to minimize the number of surveBlances performed on identified equipment, which may adversely affect safety-related systems or components during the extended AOT. SP 152 precaution step 4.6 requires, if at -
all practical, that tests not be performed on an identified list of components, where the test would cause the components to become inoperable. In addition, SP-152 '
step 3.11 identifies the components and requires a verification to be performed prior to the extended AOT to ensure the operabHity of the components, and once every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> during the extended AOT.
Question 4 -
The attemate heat removal method avaRable, in lieu of "B" RHRSW, when the-reactor vessel level is lowered should be specified by procedure, and the intended means verified available when entering the extended AOT. (page 12)
Response -
SP-152 step 4.9 lists the appropriate existing procedures which establish attemate decay heat removal. During the proposed AOT, Unit 2 wul be shut down for refueling, and Unit 2 will be maintained in accordance with existing Unit 2 TS. In addition, SP 152 wHI provide assurance that the Unit 2 reactor cavity wHl not be drained untB the RHRSW "B" loop is retumed to service or an attemate decay heat removal method is available.
Question 5 -
What means of attemate long term Emergency Core Cooling Systems are expected to be avalable per the procedure mentioned on page 97
. Response -
The "A" and "C' LPCI mode of RHR, "A" CS Icop, and HPCI WHI be available, and guidance is provided by existing procedures.-
i Question 6 -
Are the fire protection compensatory measures " appropriate established actions,"
mentioned on page 21 under item (v) (of the submittal], proceduralized?
j Response -
Compensatory measures are proceduralized in SP 152. SP-152 step 3.20 ensures j
that compensatory walk downs are performed during the extended AOT.
This information is being submitted under affirmation, and the associated affidavit is enclosed.
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g December 19,1994 Page 3 If you have any questions, please do not hesitate to contact us.
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Very truly yours,
, N.,
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G. A. Hunger, Jr.,
Director-Ucensing Enclosure cc:
T. T. Martin, Administrator, Region I, USNRC (w/ enclosure)
N. S. Perry, USNRC Senior Resident inspector, LGS (w/ enclosure)
R. R. Janati, PA Bureau of Radiological Protection (w/ enclosure)
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h COMMONWEALTH OF PENNSYLVANIA ss.
COUNTY OF CHESTER W. H. Smith, Ill, being first duly sworn, deposes and says: That he is Vice President of PECO Energy Company, the Applicant herein; that he has read the enclosed information supporting Technical Specifications Change Request No. 94441 " Temporary increase in the Allowed Outage Times for the Emergency Service Water System; Residual Heat Removal Service Water System; The Suppression Pool Cooling, the Suppression Pool Spray, and the Low Pressure CMant injection modes of the Residual Heat Removal System; and Core Spray System," for Umerick :3enerating Station, Unit 1. Facility Operating License No. NPF-39, and knows the contents thereof; and that the statements and matters set forth therein are true and correct to the best of his knowledge, information and belief.
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Vice President Subscribed and sworn to before me this / <fh I(
day of A 1994.
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