ML17139C302
| ML17139C302 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 03/23/1984 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML17139C301 | List: |
| References | |
| NUDOCS 8404110069 | |
| Download: ML17139C302 (10) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 SAFETY EVALUATION AMENDMENT NO.
21 TO NPF-14 SUS(jUEHANN STE M ELECTRIC TATI.N, UNIT 1 DOCKET NO. 50-387 Introduction The licensee in letters dated December 19, 1983, January 5,
- 1984, January 21,
- 1984, and February 23,
- 1984, proposed changes to the Technical Specifications of the operating license for Susquehanna Steam Electric Station, Unit 1 to allow revised surveillance test of the Standby Gas Treatment Systems (SGTS) to include either three zones when both Units 1 and 2
are in communication with the SGTS or two zones when Unit 2 is shutdown and isolated from the SGTS.
Changes to the SGTS surveillance procedures are necessary for the operation of the SGTS to support two unit operation.
Evaluation Under normal operation, the secondary containment zones (Zone I, Zone II and Zone III) are not interconnected; however, following the onset of a LOCA and assuming the loss of offsite power, the three zones will be interconnected.
By letter dated December 19, 1983, PP8L proposed modifications to the secondary containment drawdown time requirements for both two zone and three zone operation.
Additional clarification of the surveillance procedures necessary for the operation of the SGTS was provided in a letter dated January 5, 1984.
In each
- case, the as-built design exceeded the stated FSAR and SER criteria of providing 0.25 inches of'acuum water gauge within 60 seconds following the accident.
By letter dated January 21, 1984, the licensee proposed additional changes to the design and operation of the SGTS which included having both engineered safety feature trains of the SGTS start upon receipt of an actuation signal.
For accidents involving a loss-of-offsite power, these changes limit the (worst case) peak pressure in the secondary containment to approximately 0.125 inches of vacuum water gauge and result in a secondary containment pressure of approximately 0.20 inches of vacuum water gauge within 60 seconds following the postulated loss-of-coolant.
The maximum time for the secondary containment to reach a negative 0.25 inches vacuum water gauge is approximately 150 seconds for three zone operation and 135 seconds for two zone operation.
The licensee provided their calculations of LOCA dose with a 180-second secondary containment drawdown time.
The staff reviewed the licensee's analysis and found it to be acceptable.
8404ii0069 840323 PDR ADOCK 05000387 P
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On February 22, 1984, representatives of PP&L met with the NRC staff to discuss the proposed SGTS technical specification changes.
llhenever a two zone test is performed for each unit (Zones I and III or 7ones II and III), a separate test of Zone III will be performed within a period not to exceed 18 months from completion of either of the two-zone tests.
The results from these tests (Zone's I and III, Zones II and III, and Zone III tests) will be used to analytically verify that one SGTS will maintain the 0.25 inches vacuum water gauge in Zones I, II, and III at a flow rate of 4000 cfm.
The revised technical specification drawdown times for the surveillance tests are based on deleting the 30 second time delay in starting the redundant SGTS fan and does not include the 10 second time delay associated with loading the SGTS on the diesel.
The revised drawdown times are 83 seconds for two-zone testing for the case of Zone II isolated from 7ones I and III, and Unit 2 is shutdown; 15 seconds for two-zone testing for the case of 7one II is operable but isolated from 7ones I and III; and 92 seconds for three-zone testing.
The NRC staff requested PPSL provide clarification of the conditions under which the proposed surveillance test options would he performed.
The staff also requested PP8L to perform the three-zone test at least everv 60 months.
PPSL agreed to these changes and formally revised the SGTS technical specification change request in a letter dated February 23, 1984.
The matters contained in the February 23, 1984 submittal are considered by the NRC staff to not substantially change the proposed SGTS technical specification changes contained in the previous PPSL submittals dated December 19, 1983, January'5,
- 1984, and January 21, 1984.
One matter provides clarification, and the other makes performance of the three-zone surveillance test a requirement, rather than a test option as originally proposed in the application dated January 21, 1984.
The NRC staff has reviewed the licensee's submittals and concludes the proposed technical specifications to the SGTS are acceptable.
The results and conclusions presented in previous safety evaluations are valid for the proposed technical specifications when combined with the licensee's design modifications.
Iihile the secondary containment will not reach 0.25 inches of vacuum water gauge within 60 seconds under LOCA conditions (as described in the Standard Review Plan (SRP) Section 6.5.3), the NRC staff concludes that the modified SGTS design meets the intent of the referenced SRP section and is acceptable.
This conclusion is based upon
- 1) the peak secondary containment pressure will be less than 0.125 inches of vacuum water gauge, and 2) the secondary containment pressure at 60 seconds following the postulated LOCA is between 0.20 and 0.25 inches of'acuum water gauge for the worst case (i.e.,
three zone drawdown).
The staff also concluded that the proposed technical specification changes will not degrade the performance of the SGTS filters.
Environmental Consideration We have determined that this amendment does not authorize a change in effluent types or total amount nor an increase in power level and will not result in any significant environmental impact.
Having made this determination, we have further concluded that this amendment involves action which is insigni-ficant from the standpoint of environmental
- impact, and pursuant to 10 CFR Section 51.5(d)(4), that an environmental impact statement or negative declaration and enviromental impact appraisal need not be prepared in connection with the issuance of this amendment.
Conclusion We have concluded, based on the considerations discussed above, that:
(1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed
- manner, and (2) such activities will be conducted in compliance with the Commission's regulations and the issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public.
Dated:
MAR 29 584 DL:LB&'LPerch:pt 3/iy/84 w
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NRCPDR L PDR NSIC PRC LB82 Rdg.
EHylton RLPerch JSaltzman, SAB
- MHagner, OELD CMiles HRDenton JRutberg AToalston NGrace
- ELJordan, IE
- LHarmon, IE DBrinkman, SSPB TBarnhart (4)
GPERATIi'4 REACTORS/LICENSING BRANCH NO.
'AtlEil0i1ENT ROUTE SLIP 3/16/84 1
~ E. Hylton 2
R.
Perch A. Schwencer 4.
OELO - concurrence LA - concurrence
, project Manager - concurrence
, Branch Cnief -
on e
(OELD review is/is not requested for the enclosed Safety Evaluation)
, - signature 0 ~
, Assistant Director - approval 7.
, Branch Cnief - signature LA - assign Amendment iso.
and date
- dispatch Letter to:
N. ll. Curtis Amendment No(s).
21
Subject:
Amendment to Standb Gas Treatment S stem Technical S ecifications for Susquehanna, Unit 1
SIGNIFICAi(T HAZARDS CONSIDERATION DETERMINATION IiPFORHATION Initial Determination:
Significant Hazards Consideration (Circle one)
No Significant Hazards Consideration iiotice Period 3O ilays.
Comment If less than 30 days or hearing request Consideration Determination enclosed:
I Input for igionthly FR Notice Enclosed:
period expires 3/16/84 (date) received:
Final t<o Significant Hazards Yes Emergency or Exigency Yes tto Date Consulted with State:
Comments:
Yes tto Date checked with SECY for public comments or Petitions for Leave to Intervene:
3/16/84 Petitions filed:
Yes fto X
Comments filed:
Yes t(o X
remarks gQl
, Assistant Director, apo>
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Docket No.
UNITED STATES NUCLEAR REGULATORYCOMMISSION WASHINGTON, D.C. 20555 February 8, 1984 DI IBUTION:
ocument Control
{50-387)
LB¹2 File EHylton RPerch
- FIngram, PA Docketing and Service Section Office of the Secretary of the Commission Susquehanna Steam Electric Station {Pennsylvania Power 8
Light Company)
Two signed originals of the Federal Register Notice identified below are enclosed foryour transmittal to the Office of the Federal Register forpublication. Additional-conformed copies ( 6
) of the Notice are enclosed for your use.
0 Notice of Receipt of Application for Construction Permit(s) and Operating License(s).
g Notice of Receipt of Partial Application forConstruction Permit(s) and Facility License(s): Time for Submission of Views on Antitrust Matters.
0 Notice of 'Availabilityof Applicant's Environmental Report.
0 Notice of Proposed Issuance of Amendment to Facility Operating License, 0 Notice of Receipt of Application for Facility License(s);
Notice of Availability of Applicant's Environmental Report; and Notice of Consideration of Issuance of Facility License(s) and Notice of Opportunity for Hearing.
0 Notice of Availabilityof NRC Draft/Final Environmental Statement.
0 Notice of Limited Work Authorization.
0 Notice of Availabilityof Safety. Evaluation Report.
0 Notice of Issuance of Construction Permit(s).
0 Notice of Issuance of Facility Operating License(s) or Amendment(s).
~ Other. Notice of Consideration of Issuance of Amendment to Facilit Operating License and Proposed Ho Significant Hazards Consideration determination and opportunity for Hearing.
application dated December 19, 1983, as amended b'y licensee letters dated January 5, 1984, and January 21, 1984.
Enclosure:
As Stated Office of Nuclear Reactor Regulation OFFICE~
SURNAME~
DL:LB¹2 RISHI on:pt 2/8 /84 NRC FORM 102 7~79oioo pnDS'9
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