ML17139B146
| ML17139B146 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 10/04/1982 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML17139B145 | List: |
| References | |
| NUDOCS 8210290130 | |
| Download: ML17139B146 (4) | |
Text
Introduction SAFETY EVALUATION AMEN ti~t<
N d lu N F-14 SUSgUEHANIA STEA!'I ELECTRIC STA ON, UNIT 1 UUCKE NU. bU"35 The licensee proposed changes to the Technical Specifications of the operating license for Susquehanna Steam Electric Station, Unit 1 which are as follows:
(a)
In Specification 4.8.1.1.2.d.l2, change the diesel surveillance requirement for the initial start in less than or equal to 10 seconds and the subsequent four starts in less than or equal to 25 seconds.
(b)
In Table 4.8.1.1.2-2 to Specification 4.8.1.1.2, change the four emergency service water pump time settings from 55 seconds to 40
- seconds, 40 seconds, 53 seconds and 57 seconds, respectively.
Evaluation a)
Diesel Surveillance Re uirement In Specification 4.8.1.1.2.d.l2, the licensee requested a change in the requirement by the addition of "for the initial start and less than or equal to 25 seconds for each subsequent start.", to the end of the present statement.
10290130 821004 PDR, ADOCK 05000387 poa'2 In support of this request, the licensee provided a letter dated September 24, 1982 which reiterated a previous request contained in a letter dated July 9, 1982.
Supplemental information was provided by the licensee on July 14, 1982.
The staff did not agree with the initial proposal, but deferred the effective date of Specification 4.8.1.1.2.d.12 to after first exceeding 55 of rated thermal power and requested additional information from the licensee on July 22, 1982.
The licensee responded to this request in a letter dated September 2, 1982.
The starting times provided by the licensee in the letter of July 14, 1982 were compared against the assumptions used in the FSAR ECCS analyses for Susquehanna.
The first two start times provided in the July 14, 1982 letter satisfy the ECCS analysis assumptions.
From the information available in the letter of September 2, 1982, the fifth start of the diesels was accomplished in less than 19 seconds.
The licensee has not provided an updated ECCS analysis to support start times up to the proposed 25 seconds.
The staff evaluated diesel generator starting times up to 19 seconds in the ECCS analysis which indicated the maximum peak clad temperatures will riot be exceeded.
Therefor e, diesel generator starting times up to 19 seconds or less are acceptable for Susquehanna.
On this
- basis, the staff has r evised Specification 4.8.1.1.2.d.12 witti the addition of "for the first 2 starts and accelerates to at least 600 rpm in less than or equal to 19 seconds for the remaining 3 starts.",
to the end of the present statement.
SURNAME/
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NRC FORM 318 (10.00) NRCM 0240 OFFIClAL RECORD COPY USGPO: 1981 335 960
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b)
Emer ency Service Water Pum Time Settings In Table 4.8.1.1.2-2 of Specification 4.8.1.1.2, the licensee requested a change to the timer settings for the Emergency Service Mater (ESH) pumps which previously started simultaneously at 55 seconds after a diesel start, to a staggered start with A and B ESH pumps started at 40 seconds, the C pump started at 63 seconds and the 0 pump started at 57 seconds after a diesel start.
The licensee requested the change to mitigate water hammer effects on the ESW system through a more gradual filling of the system.
The licensee stated the staggered start of the ESH pumps does not increase the probability of occurence or the consequences of an accident or malfunction of equipment related to safety as previously evaluated.
Based on a review of plant voltage studies and the diesel generator load sequence study'he licensee stated the proposed change does not affect the integrity of the equipment being cooled and does not adversely affect the diesel generator loading or the 4kV system if'ffsite power is available.
The staff has reviewed the licensee's Justification and finds the changes to the ESH pump timer settings acceptable.
Environmental Consideration He 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.
)laving made this determination, we have further concluded that this amendment involves action which is insignificant 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 environmental impact appraisal need not be prepared in connection with the issuance of this statement.
Conclusion He have concluded, based on the considerations discussed above, that:
(1) because the amendment does not involve a significant increase in the probability or consequences of accidents previously considered, does not create the possibility of an accident of a type different from any evaluated previously, and does not involve a significant decrease in a safety margin, the amendment does not involve a significant hazards consideration, (2) there is reasonable assurance that the health and safety of the public will not be endanagered by operation in the proposed
- manner, and (3) such activities will be conducted in compliance with the Comnission's regulations and the issuance of this amendment will not be inimical to the cotton defense and security or to the health and safety of the public.
Dated:
OQT 4 1982 DL LB2 OFFICEI SURNAME II RPerch/1g T074702'"""-
DATE P NRG FORM 318 (10-80) NRCM 0240
'YO/jp/82'
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OFFICtAL RECORD COPY USGPO: 1881 888.980