U-600636, Forwards Responses to Questions Re Amends to FSAR Chapter 8, Electric Power. FSAR Will Be Updated in Future Amend. Response Closes Out Sser 6 Issues

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Forwards Responses to Questions Re Amends to FSAR Chapter 8, Electric Power. FSAR Will Be Updated in Future Amend. Response Closes Out Sser 6 Issues
ML20203D707
Person / Time
Site: Clinton Constellation icon.png
Issue date: 07/18/1986
From: Spangenberg F
ILLINOIS POWER CO.
To: Butler W
Office of Nuclear Reactor Regulation
References
U-600636, NUDOCS 8607210271
Download: ML20203D707 (3)


Text

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  • U-600636 L30-86 (07-18)-L 1A.120 ILLINDIS POWER 00MPANY CLINTON POWER STATION, P.o. Box 678. CLINTON. ILLINotS 61727 July 18, 1986 Docket No. 50-461 Director of Nuclear Reactor Regulation 1 Attention: Dr. W. R. Butler, Director BWR Project Directorate No. 4 Division of BWR Licensing U. S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

Clinton Power Station FSAR Chapter 8 Electric Power

Dear Dr. Butler:

The responses to the NRC Staff questions from the review of recent amendments to FSAR Chapter 8 Electric Power are in Attachment 1. The responses provide supporting information to clarify the IP position in the FSAR or change the FSAR to resolve the NRC Staff question. The change to the FSAR will be documented by this letter and the FSAR will be updated in a future amendment. This letter is expected to close out these issues in Supplement No. 6 to the Safety Evaluation Report.

Please contact me if additional information is needed.

Sincerely ours, 1

. - lh F. A. S ange erg Manage -L ensi and Safety PJT/kaf Attachments cc: B. L. Siegel, NRC Clinton Licensing Project Manager NRC Resident Office Illinois Department of Nuclear Safety Regional Administrator, Region III, USNRC 8607210271 860718 4 PDR ADOCK 00000461 E PDR OOb 8l:

l Attachmsnt 1 Pags 1 of 1 IP Response to NRC Staff Comments on FSAR Chapter'8 Electric Power

1. Regulatory Guide 1.75 " Physical Independence of Electric Systems" NRC Comment. FSAR Section 8.1.6.1.14 Position C.10 (page 8.1-13) states that divisional marking may be delayed until completion of a cable pull. What procedures are in place to assure taat the cables are pulled through the correct conduit (1E vs. Non IE) if not marked until after the pull?

IP Response. The Plant Staff Procedure CPS No. 8491.01 CABLE PULLING is being revised to ensure that a Quality Control (QC) hold point is added to verify that proper cable routing and separation ,

is checked.

2. Flame Retardant Cables NRC Comment. FSAR Section 8.3.1.4.5.1 (page 8.3-31). This section states that a small percentage of cables are not flame retardant and are addressed in the Fire Protection Evaluation Report (FPER).

The NRC has accepted this based on testa performed at Wyle Labs.

Did Wyle use this non-flame retardant cable in their tests? If not, special cable separation distances will have to be different than that accepted.

IP P.esponse. IP conducted a walkdown of non-flame retardant cable.

The results of the walkdown are in the attached memo, " Review of the Non-IEEE-383 Cable Installation for Electrical Separation Requirements," (Attachment 2).

3. Reactor Protection System Power Supply NRC Comment. FSAR Sectton 8.3.1.1.3.1.2.b (page 8.3-13) . The wnrds " Class 1E" were daleted from the description of the Nuclear System Protection System (NSPS) non-divisional 120 VAC. The NSPS power supply is designed and mainte.ined as a Class 1E system that is supplied by a non Class 1E power source. Words to the effect of "the NSPS has been designed and is maintained as a Class 1E system however the input is non Class 1E" should be added.

IP Response. FSAR Section 8.3.1.1.3.1.3 (page 8.3-13a) states that the two non-divisional 120 VAC power supplies are Class 1E. Item 3.A of Attachment 1 in IP Letter U-600477 " Electrical Circuits Inspection," dated March 17, 1986, describes the FSAR section and CPS procedures which are in place to maintain the Reactor Protection System power supplies as Class 1E.

FSAR Change. IP will revise the FSAR as requested by the Staff.

The following sentence will be added to Paragraph B of Section 8.3.1.1.3.1.2:

"The RPS was designed and is maintained as a Class 1E systen."

Attachmtnt 2 Pags l'of 1

,t 4

Review oi the Non-IEEE-383 Cable Installation I for Electrical Separation Requirements A review of the scheduled cables has been performed to determine if any i non-IEEE-383 qualified cables are installed in non-divisional trays such that the proximity of these trays with safety division trays may have compromised IEEE-384 separation requirements. _( Note: Only IEEE-383

, qualified cables are used in safety division trays. Only scheduled cables are allowed in the cable trays.)

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A review of the scheduled cables was performed to identify those cables l not qualified to IEEE-383 requirements. Rcuting design evaluation of the non-IEEE-383 qualified cables was performed to identify the cables-4 which are entirely rcuted in conduit and the cables that are routed in trays for either partial or entire length, j

It has been determined that ninety-one (91) cables are partially routed in tray. Of these cables, thirty-one (31) cables are entirely rcuted in non-seimnic buildings and do not run' in proximity of class 1E cables, I

thus are not separation concern.

Of the remaining sixty (60) cables, thirteen (13) cables have been j replaced with Tefzel cables qualified to IEEE-383. Twenty-nine (29) of the remaining forty-seven (47) cables are the turbine-generator Electric

, Hydraulic Control (EHC) interface cables supplied by General Electric.

While not fully qualified to IEEE-383, these cables do meet vertical tray flame test criteria of Section 2.5.2.1 of IEEE 383-1974 and thus are not a concern of this analysis.

i j Two (2) of the remaining eighteen (18) cables are fiber optic cables and 4

as earlier confirmed by NRC, fiber optic cables can be excluded from this analysis, since they do not carry electricity.

l The remaining cables include fifteen (15) instrument cables and one power cable. Review of the installation drawings and field verification of the entire route indicated that all the instrument cables are routed in covered instrument trays and the installation meets IEEE-384 requirements. Ihe power cable is routed in the screenhouse such that there are no safety divisional trays nearby.

, This review of the non-IEEE cables installed at-CPS demonstrates that l the installation meets the IEEE-384 separation requirements and does not l j depend on the reduced separation criteria based-on the Wyle Laboratory test results stated in CPS FSAR.