ML20215N817

Application for Amend to License DPR-46,consisting of Proposed Change 41 to Tech Specs,Incorporating Primary Containment Surveillance Instrumentation & Torus Temp Monitoring Sys.Fee Paid

ML20215N817
Person / Time
Site:	Cooper
Issue date:	10/31/1986
From:	Kuncl L NEBRASKA PUBLIC POWER DISTRICT
To:	Muller D Office of Nuclear Reactor Regulation
Shared Package
ML20215N818	List: ML20215N817 ML20215N825
References
NUDOCS 8611070307
Download: ML20215N817 (6)

Text

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l Nebraska Public Power District * "%h5k'hbesM *"

S October 31, 1986 Office of Nuclear Reactor Regulation BWR Project Directorate No. 2 Division of BWR Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attention: Mr. Daniel R. Muller

Subject:

Proposed Change No. 41 to Technical Specifications Cooper Nuclear Station NRC Docket No. 50-298, DPR-46 In accordance with. the applicable provisions specified in 10CFR50, Nebraska Public Power District requests that Technical Specifications for Cooper Nuclear Station (CNS) be revised to incorporate the change listed below:

Attachment Subject 1 Primary Containment Surveillance Instrumentation 2 Torus Temperature Monitoring System A tifscussion and the applicable revised Technical Specification pages are co9tained in each attachment. Each change has been evaluated with respect to the requirements of 10CFR50.92 with the results included within each attachment.

This proposed change incorporates all amendments to the CNS Facility Operating License through Amendment 102 issued September 25, 1986.

This change has been reviewed and approved by the onsite Safety Review Committee and is under review by the offsite Safety Review Committee.

Payment of $150 is submitted in accordance with 10CFR170.12.

In addition to three signed originals, 40 copies are also submitted for your use. Should you .have any questions or require additional information, please contact me.

S,e ely, 1

J L. G. uncl Vice-Pr'esident, Nuclear LGK/gme:dmr23/5 L Attachment p g cc: H. R. Borchert Department of IIcalth g p.

1 State of Nebraska 8 8611070307 861031 PDR ADOCK 05000298

. P PDR-

Mr. Daniel Mull:r P:ge 2 October 31, 1986 STATE OF NEBRASKA)

)ss PLATTE COUNTY )

L. G. Kuncl, being first duly sworn, deposes and says that he is an authorized representative of the Nebraska Public Power District, a public corporation and political subdivision of the State of Nebraska; that he is duly authorized to submit this request on behalf of Nebraska Public Power District; and that the statements contained herein are true to the best of his knowledge and belief.

D L.)G. Kuncl Subscrib d presence and worn to before me this 3/4/. day of

/)yy IIMML WDAVaak sitensia 3 H/- COLLEEN M. KUTA lly Caust Em Ast4 .190 NOTARY PLJBL1C 1

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. s Attachm:nt 1 Revised Technical Specifications for Primary Containment Surveillance Instrumentation Revised Pages: 65 80 This request ' covers the ' replacement of PC-PT-512A and PC-PT-512B pressure -

transmitters with recorders PC-PR-2A and-PC-PR-2B. The replacement of these drywell pressure transmitters will bring them into conformance with the Control

. Room Design Review Specifications. The replacements will allow the operators to read the drywell pressure in PSIG units instead of PSIA and then having to convert the PSIA units to PSIG units. The new transmitters are seismically and environmentally qualified.

The suppression chamber / Torus water temperature instrument is also being changed which is described in Attachment 2.

Evaluation of this Revision with Respect to 10CFR50.92

. A. The enclosed Technical Specification change is judged to involve no significant hazards based on the following:

1. Does the proposed license amendment involve a significant increase in the probability or consequences of an accident previously evaluated?

Evaluation: __ ___

This proposed change will replace existing equipment. These replacement instruments will have a wider indicating range than the instruments they replace. Additionally, the new instrumentation will be powered from two divisions instead of one as was previously done, and therefore, will be more reliable. As a result,'the probability or consequences of an accident previously evaluated are not significantly increased. .

2. Does the proposed license amendment create the possibility for a new or different kind of accident from any accident previously evaluated?

Evaluation:

This new system is an upgraded version of the present system which

! presents units in PSIG instead of PSIA. Because the old system indicated in PSIA, it forced the operators to do a conversion to PSIG. The new instrumentation will eliminate that conversion. As a result, this change does not create the possibility for a new or different kind of accident from any accident previously evaluated.

3. Does the proposed amendment involve a significant . reduction in. a margin of safety?

Evaluation:

Once this equipment is installed the margin of safety will be slightly increased due to the increase in reliability as a result of the separation of divisions and the seismic and environmental qualification of the new instrumentation.

B. Additional basis for proposed no significant hazards consideration determination:

The commission has provided guidance concerning the application of the :

standards for determining _ whether a significant hazards consideration exists by providing certain examples (48CFR14870).

In reviewing those examples. for this request, it was found that this request does not clearly fall into the scope of any of the examples

.provided.

Attachmsnt 2 Revised Technical Specifications,for

. Torus Temperature Monitoring System Revised Pages: 65 66 80 Amendment No. 88. was issued to the Cooper. Nuclear Station (CNS) Facility Operating License to incorporate into Technical Specifications, among other things, changes performed on the Torus Temperature Monitoring System to satisfy the requirements of the Mark I Long-Term Program. The Technical Specifications were revised to denote new instrument I.D. numbers and to require a minimum of four operable instrument channels. Recent NRC_ questions indicated confusion existed with the required action statements if the number of operable channels was less than four. In particular, the action statements on page 66 do not tell what to do if only three or two operable channels exist.~

The action statementi as written, reflect a required minimum of two operable channels, not fort, as in the case of Torus water temperature.

Accordingly, Nebraska Public Power District ' proposes to eliminate this confusion by making the following revisions to the Technical. Specifications:

I

1. Cha::ge the Action Statements for the Torus water temperature instrument to G, H, I on page 65.

2. Add Action Statements G, H, and 1 to page 66.

In addition, pages 65 and 80 are'being changed to reflect the addition of a separate, redundant recorder to monitor Torus water temperature. The recorder is being installed as part of the Detailed Control Room Design Review (DCRDR) process and as part of the Reg. Guide 1.97 ef fort. The sixteen (16) sensor channels are split into two redundant instrument trains of eight (8) sensors each for better reliability. The instrument I.D. number for Torus water temperature is being changed to reflect the addition of this new recorder (PC-TR-25).

Evaluation of this' Revision with Respect to 10CFR50.92 1 A. The enclosed Technical Specification change is judged to involve no significant hazards based on the following:

1. Does the proposed license amendment involve a significant increase in the probability or consequences of an accident previously evaluated?

Evaluation:

The proposed change places additional limitations on the amount of time operation is permitted with a reduced number of operable Torus water temperature instrument channels. This change will impose action requirements when only three or two operable channels of Torus water temperature instrumentation exist. No such action requirements

currently exist in the Technical Specifications. The addition of a j redundant temperature recorder for Torus temperature for Reg.

Guide 1.97 requirements will not involve a significant safety hazard.

V All modifications described in this attachment have received a human factors evaluation in the DCRDR process. It therefore does not involve a significant increase in the probability or consequences of an accident previously evaluated.

2. Does clie proposed license amendment create the possibility for a new or different kind of accident from any accident previously evaluated?

Evaluation:

The proposed change only affects the instrumentation requirements for Torus water temperature and does not introduce a new mode of operation that could create the possibility for a new or different kind of accident from any previously evaluated.

3. Does the proposed amendment involve a significant reduction in a margin of safety?

Evaluation:

The margin of safety is enchanced because the proposed change will increase the required _ number of operable Torus temperature instruments available to aid the operator in monitoring containment performance during conditions such as a LOCA. The addition of a redundant safety-grade Torus temperature recorder will better ensure instrument availability during accident conditions and will not involve a significant reduction in a margin of safety.

B. Additional basis for proposed no significant hazards consideration determination:

The commission has provided guidance concerning the application of the standards for determining whether a significant hazards consideration ,

exists by providing certain examples (48CFR14870). The examples include:

"(ii) A change that constitutes an additional limitation, restriction, or control not presently included in the Technical Specifications." The proposed change will add limitations to the times when the number of operable channels of Torus water temperature is reduced to two or three that are not presently in place, so this change is an example of the type discussed above.

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