ML19329F151

Describes Proposed Program for Upgrading STS Bases & Benefits Expected.Requests Util & NSSS Vendor Participation. Info Request & List of Potential Plant Participants Encl

ML19329F151
Person / Time
Site:	Davis Besse, Arkansas Nuclear, Crystal River, Midland, Washington State University, Crane
Issue date:	08/26/1977
From:	Varga S Office of Nuclear Reactor Regulation
To:	Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
NUDOCS 8006200711
Download: ML19329F151 (7)

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- The Standard Technical'8pecifications (STE)'for' each lessWdor type plast ~g I

currently contain a bases section that provides background information and GO tednical suggort for each specification. The information in the bases ham & ?

' proven to be useful in enabling plant operators, and others involved in the T operation or licensing activities of a facility, to better understand the ' ja reasons for the various specifications. It has also been useful to both o

licensees and the NRC staff as a technical summary of the plant design bases and the interrelationship of many of the safety considerations associated with operation of a plant. Consequently, the bases have served not only as

. support for the STS, but as training material for licensee personnel and, to',

,7 -some eatent, as 'a source of background material for the MRC staff. in revieir 4

t ing certain licensing actions.n me believe a number of benefits could be5 @

v-W gained if the SIS. bases were t.egra.ded.E,Among the major benefits we foreseeL' -.

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, ' ~.1. f Technical specification change requests could be processed in less; ion.y G _

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'able in the bases. 'Since a large amount of effort is expended by

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influencing a typical change request, we believe the potential

. My7 YWyganvings in manpower effort resulting from this improves. ant would

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1. _. A s. Weslection of technical specification limits and requirements would gS My NiW$k materialbMW

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' that cecur from tilse to time,.could be more easily resolv t.;m -*1icensees and the Office of Inspection and Enforooment

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' minimizing the adverse igact of transfer or reassignment of. x d, A W A. individuals who may poseems detailed knowledge related to the evop&

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' Accordingly, we are initiating a program to upgrade the bases section of Q'3fy...

. each generic Trs. The program includes upgrading the basse for section 2, g;g ':

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" safety Limita and Limiting safety System settings," and sections 3 and 4,193

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/ >; " Limiting condition for Operation".andt' surveillance Requirements.* C2he ' d%g Q ^ some reorganisation of the information c

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'f.J rationale for oedt specifiestion in those acetions?This will: require T l

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the upgraded Sr8 bases is provided in Enclosure 1.

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As part of our' continuing policy of involving the industry in the further -

retinoment and igrovement of the 51ss, we are inviting your participatica in this effort as one of those facilities either already in operation or scheduled for operation with STS in the near future..Your NSSS vendor is also being invited to participate. Upon conpletion, we will incorporate the revised bases into the STS for all future operating licenses. SIS facilities in operation may then elect, at their option, to upgrade their existing technical specification bases to reflect this improvement.._.f'g 4

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w f we,would appreciate your letting us know if you are willing to partici- ~ p 31-A pate so that we can schedule a meeting with you, your vendor, and the J -' '

other participating utilities at some time in the near future. At this - _ j t....

i meeting, we.could dimman the objectives of the program, and mutually

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. develop plans for e-lishiw the upgrading of the bases in a systematic.S

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'a list of those facilities being invited to participate in this program, p,,./ j l 3

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,'..If you have any questions regarding this program, or care to discuss it '

furtner, please contact us. In any event, we would appreciate hearing

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ENCLOSURE NO. 1 INFORMATION TO BE PROVIDED FOR UPGRADED STS BASES PROGRAN-Fundamentally, the infomation in the bases for each specification should (1) describe why the specification is needed (i.e., identify t

its purpose), (2) explain why the quantitative values used as limits in the specification were chosen, and (3) indicate the margins of safety provided by the limits. To present this information 'in a clear and orderly fashion, a standardized format for the bases for each specification should be used.

In our view, the standardized fomat should contain three basic parts:

(1) Purpose, (2) Supporting Infomation, and (3) Margin of Safety. The information presented in each part should be in the fom of concise sumary statements and/or tabulations of data that serve to support the specification.

The type of information that should be provided is delineated below.

1.

PURPOSE The purpose of the specification should be stated in terms of the conditions the specification has been fomulated to establish or maintain. Any multiple purposes should be identified.

2.

SUPPORTING INFORMATION Infomation to support the quantitative values of the limits established by the specification should be provided in this part. The limiting value(s) of the specification should be supported in tems of the most restrictive plant variables or conditions used to establish the limit.

In addition, pertinent infomation associated with the specification that relates to plant features or operating considerations should be provided.

The manner in which the surveillance requirements ensure that 4

the limits are maintained should be stated for surveillance whose intent is not obvious.

The assumptions relating to the establishment of the limiting i

value or condition should be stated in tems of each of the i

factors applicable to the specification. These factors should, where possible, include:

1 EThis program includes upgrading the bases for only Sections 2, 3, and 4 of the STS. Sections 5 and.6 are not included.

2-a.

Assumptions of initial operating conditions.

b.

Assumed allowances for instrument bias factors including error, drift and calibration considerations, c.

Assumed uncertainties associated with measurement of physics related parameters such as void and moderator temperature coefficient, rod worth and boron concentration.

d.

Assumed allowances related to uncertainties in tank volumes including considerations of unusable fluid volumes resulting from tank physical characteristics (vortexing, suction pipe elevation). Assumed minimum pump flow and discharge pressure characteristics including allowance for expected degradation.

- 3.

MARGIN OF SAFETY JThe resultant margin of safety obtained from consideration of the above factors should be provided in a definitive manner such that the relationship between specification limiting values i

and any related safety analyses assumptions is clearly established.

Methodology such as probabalistic or statistical analyses techniques or the use of cumulative addition of factors in a non-conservative manner should be stated. Conformance with applicable provisions of Regulatory Guides, General Design 4'

Criteria or the Code of Federal Regulations should also be stated where applicable.

Much of the infonnation for part (1) and to a lesser extent, part (3) of the standardized bases ~ format is currently provided for a number of specifications in the STS. A reorganization and expansion of this information is what is sought. On the other hand, the 4

information relating to-assumptions which is to be provided in Part (2) would ~be new for most of the specifications.

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ENCLOSURE NO. 2 LIST OF FACILITIES REQUESTED TO PARTICIPATE IN UPGRADED STS 8ASES PROGRAM NSSS VENDOR BABC0CK & WILC0X Arkansas Unit 1 Three Mile Island Unit 1 Midland Units 1 and 2 Washington Nuclear 1 Crystal River Unit 3 Davis-Besse Unit 1 6

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Distribution of Iatter to Applicant on Upgraced STS Bases Program Docket File NBC PDR Incal PDR LWR 14 File S. A. Varga M. Service D. Hood R. Boyd R. DeYoung D. Vassallo F. Williams H. Snith J. Felton K. Goller J. Whetmore IEE (3) bec: ACRS (16) 4 I

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