View source for 0CAN068812, Responds to NRC 880523 Request for Addl Info Re Spds.Util Will Evaluate Rochester Instrument Sys Model SC-1302 & Energy,Inc Model 00993-4 Isolators Against 120-volt Ac 20 Amp Guidance.Evaluation of Test Data Expected by 880815

{{Adams
| number = ML20150F834
| issue date = 06/30/1988
| title = Responds to NRC 880523 Request for Addl Info Re Spds.Util Will Evaluate Rochester Instrument Sys Model SC-1302 & Energy,Inc Model 00993-4 Isolators Against 120-volt Ac 20 Amp Guidance.Evaluation of Test Data Expected by 880815
| author name = Howard D
| author affiliation = ARKANSAS POWER &amp; LIGHT CO.
| addressee name = Harbuck C
| addressee affiliation = NRC OFFICE OF NUCLEAR REACTOR REGULATION (NRR)
| docket = 05000313, 05000368
| license number = 
| contact person = 
| document report number = 0CAN068812, CAN68812, TAC-51219, TAC-51220, NUDOCS 8807190080
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE, UTILITY TO NRC
| page count = 2
| project = TAC:51219, TAC:51220
| stage = Request
}}

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ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 UTTLE ROCK. ARKANSAS 72203 (501)371-4000 June 30, 1988 OCAN068812 U. S. Nuclear Regulatory Commission Document Control Desk Mail Station P1-137 Washington, DC 20555 ATTN:   C. Craig Harbuck, Project Manager Project Directorate - IV Division of Reactor Projects - III, IV, V and Special Projects

==SUBJECT:==
Arkansas Nuclear One - Units 1 & 2 Docket Nos. 50-313 and 50-368 License Nos. DPR-51 and NPF-6 Response to Additional Information Request Safety Parameter Display System (SPDS)
(TAC Nos. 51219 and 51220)

==Dear Mr. Harbuck:==

Your {{letter dated|date=May 23, 1988|text=letter dated May 23, 1988}} (0CNA058831) requested additicnal information                  i on unresolved questions regarding fault testing of certain isolation devices used in the AN0 Safety Parameter Display System (SPDS).             Due to the extensive time period involved in the review of this issue and the resulting lack of continuity in NRC review personnel, a discussion of pertinent background information is provided below. As stated in our {{letter dated|date=October 28, 1985|text=letter dated October 28, 1985}} (0CAN108504), which responded to an additional information request dated August 7, 1985 (BCNA088507), and reiterated in several subsequent phone conferences with the staff reviewers, the AN0 SPDS was designed and installed with suitable isolation from safety systems, per the guidance of Item 4.1.c of NUREG-0737 Supplement 1.      The isolation devices used in the SPDS are similar, and in some cases the same, as those used between plant safety (protection) systems and plant computer and/or indication cystems, which are discussed in the ANO-1 and 2 SARs.
Specific information related to this issue was provided, in a draft submittal dated July 17, 1986, to the ANO-2 Project Manager. Subsequent discussions pertaining to the maximum credible faults were held during phone conferences with the AN0 Project Manager and staff reviewers on July 28, 1986 and August 6, 1986. In lieu of identifying formal guidance documents (i.e.,                       !
IEEE Standards, Regulatory Guides, etc.) for deriving maximum credible faults that an isolator must protect against (for the purpose of determining suitability), the staff indicated that for ANO the maximum credible fault 8807190080 880630 PDR   ADOCK 05000313 ln)o gi i
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June 30, 1988 voltage and current for the AN0 SPOS isclation devices were 120VAC and 20 amps, respectively, based on the highest voltage present in the cabinet containing the isolators and the current rating of the feeder breaker (s) external to the cabinet. .The reviewer stated that the internal 1 to 3 amp fuses could not he
     .            credited per the staff's interpretation. This position superceded the information found in our draft submittal dated July 17, 1986, which identified 240VAC and 20 amps as the maximum credible fault voltage and current.
To resolve this issue, AP&L will evaluate the Rochester Instrument Systems (RIS)
                , model SC-1302 and the Energy Incorporated (EI) model 00993-4 isolators against the 120VAC 20 amp guidance provided by the staff in the above referenced.
telephone calls. The suppliers of these devices have indicated that they have performed additional tests at the voltage and current of interest to ANO applications since our previous discussions with the staff. Upon evaluation of this testing for applicability to ANO, AP&L will inform the staff of the results. If the test results are not appropriate for ANO, AP&L will perform 4.iditional testing to demonstrate the suitability of these isolation devices.
The results of our evaluation of the vendors' test data is expected to be-completed by August 15, 1988. We will advise you at that time of those results and our schedule for any later testing should it be necessary.
Very truly yours, t-                                                         !           .ggise an R. Ho Manager (y    d censing ORH: RBT
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