ML19317F625
| ML19317F625 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse, Arkansas Nuclear, Crystal River, Midland, Washington Public Power Supply System, Crane  |
| Issue date: | 08/19/1977 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Roe L TOLEDO EDISON CO. |
| References | |
| NUDOCS 8001220911 | |
| Download: ML19317F625 (7) | |
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s DISTRIBUTION Docket File NRC PDR Local PDR LWR-#1 File JStolz Docket No.50-34o.
AUG 19197EEngle EHylton O
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RBoyd Toledo Edison Company RDeYoung ocE ATIN: rir. l.owell E. Roe DVassallo m-Vice Presiaent, Facilities FWilliams D
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Edison Plaza JFelton 300 dad 1 son Avenue KGoller Toledo, Onio 43652 JWhetmore IE (3)
Gentlemen:
bec: ACRS (16)
SdJJECT: UPGRADEu STS BASCS PROGRM - DAVIS-BESSE, UNIT 1 Tne Standard Tecnnical Specifications (STS) for each NSSS vendor type plant currently contain a Dases section that provices background information and technical support for each specification. Tne information in tne bases has
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proven to De useful in enaDling plant operators, and others involved in the operation or licensing activities of a facility, to oetter uncerstand tne reasons for the various specifications. It has also been useful to botn licensees and the haC staff as a technical susnary of the plant design bases anc tne interrelationsnip of many of the safety considerations associated witn operation of a plant. Consequently, the bases have served not only as support for tne STS, sut as training matarial for licensee personnel ano, to some extent, as a source of cackground material for the NRC staf f in review-ing certain licensing actions. We believe a numoer of benefits coulo oe gainea if the STS Dases were upgraded. Among the major cenefits we foresee are:
1.
Technical Specification change requests could be processed in less time and with recuced manpower since much of tne detailed information affecting consideration of the pending cnange would be readily avail-aDle in the Dases. Since a large amount of effort is exoendea Oy eacn of our staffs in researching and reviewing all of the factors influencing a typical enange request, we believe the potential savings in appower effort resulting frose tnis improvement would be significant for botn licensees and the hid',.
2.
Tne relationsnip and effect of each of the factors influencing the selection of tecnnical specification limits and requirements woula be more clearly understood by users of the documents tnereby increas-ing the usefulness of tne specifications as operator training material jy /7-h, for your staff.
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AUG 191977 3.
Questions involving interpretatho of sne technical specifications, that occur from time to time, coub.i be more easily resolved oetween licensees and the Office of Inspecteon and Enforcement.
4.
The continuity of detailed technical infonnation would be preserved in a systematic manner througnout the facility lifetime tnereby minimizing the adverse impact of transfer or reassignment of indiviouals wno say possess detailed knowledge related to the evo-lution of tne facility specifications.
Accordingly, we are initiating a program to upgrade the cases section of eacn generic STS. The program includes upgrading tne bases for Section 2
" Safety Limits and Limiting Safety System Settings," and Sections 3 and 4,
" Limiting Condition for Operation
- and " Surveillance Requirements." The I
objective of tne program is to provide a more definitive and detailed rationale for eacn specification in these sections. This will require some reorganization of the information currently in tne cases, as well as tne development of additional information. A suggested format for and tne type of information that we believe should be considered for inclusion in l
sne upgraded STS bases is provided in Enclosure 1.
As part of our continuing policy of involving the incustry in the furtner refineraent and improvement of the STSs, we are inviting your participation in tnis effort as one of tnose facilities eitner alreacy in operation or seneculed for operation with STS in the near future. Your NSSS vendor is also being invited to participate. Upon completion, we will incorporate tne reviseo cases into the STS for all future operating licenses. STS facilities in operation may then elect, at tnetr option, to upgrade their existing tecnnical specification cases to reflect this improvement, ne would appreciate your letting us know if you are willing to partici-pate so that we can senecule a meeting with you, your vendor, and tne otner participating utilities at some time in the near future. At thi s meeting, we could discuss tne objectives of the program, and :autually develop plans for accomplishing the upgrading of the bases in a systematic manner.
In sne event you feel it would be beneficial to form a generic users group, a list of those facilities being invited to participate in this program, and who utilize the same 2S55 vendor, is provided for your information in enclosure 2.
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. If you nave any questions regarding this program, or care to discuss it further, please contact us.
In any event, we would appreciate hearing from you witnin tne next few weeks.
Sincerely, Origin 31 signed by John F. SS AZ Jonn F. Stolz, Chief Light Water Reactors Branch No.1 Division of Project Management
Enclosures:
1.
Information to be Provided for upgraded STS Bases Program 2.
List of Facilities Requestea to participate cc w/ enclosures:
See next page
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Toledo Edison Company AUG 191977 cc: Gerald Charnotf, Esq.
Snaw, Pittsan, Potts & Troworidge 1000 M Street, N. W.
Washington, D. C.
20uS6 Leslie Henry, Esq.
Fuller, Seney Henry and Hooge 300 Mac1 son Avenue Toledo, Ohio 43604 Mr. Donald H. Hauser, Esq.
The Clevelano Electric Illuminating Company P. O. Bex 5000 Cleveland, Ohio 44101
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n ENCLOSURE NO. 1 INFORMATION TO BE PROVIDED FOR UPGRADED STS BASES PROGRAN-Fundamentally, the information in the bases for each specification should (1) describe why the specification is needed (i.e., identify 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 format 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 summary 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 formulated 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 tenns of the most restrictive plant variables or conditions used to establish the limit.
In addition, pertinent information associated with the specification that relates to plant features cr operating considerations should be provided.
The manner in which the surveillance requirements ensure that the limits are maintained should be stated for surveillance whose intent is not obvious.
The assumptions relating to the establishment of the limiting value or condition should be stated in terms of each of the factors applicable to the specification.
These factors should, where possible, include:
UThis program includes upgrading the bases for only 50ctions 2, 3, and 4 of the STS.
Sections 5 and 6 are not included.
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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 baron concentration.
d.
Assumed allowances related to uncertainties in tank volumes including considerations of unusable fluid volumes resulting elevation) physical characteristics (vortexing, suction pipe from tank Assumed minimum pump flow and discharge pressure characteristics including allowance for expected degradation.
3.
MARGIN OF SAFETY drhe resultant margin of safety obtained frcm consideration of the above factors should be provided in a definitive manner such that the relationship between specification limiting values and any related safety analyses assumptions is clearly established.
Methodology such as probabalistic oa 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 Criteria or the Code of Federal Regulations should also be stated where applicable.
Much of the information 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 information relating to assumptions which is to be provided in part (2) would be new for most of the specifications.
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E?; CLOSURE NO. 2 LIST OF FACILITIES REQt[fSTED TO PARTICIPATE IN UPGRADED STS' SA$TT 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 O
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