RBG-24481, Suppls 860228 & 850515 Responses to Generic Ltr 82-33, Requirements for Emergency Response Capability. Status of SPDS & Digital Radiation Monitoring Sys Discussed

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Suppls 860228 & 850515 Responses to Generic Ltr 82-33, Requirements for Emergency Response Capability. Status of SPDS & Digital Radiation Monitoring Sys Discussed
ML20210T789
Person / Time
Site: River Bend Entergy icon.png
Issue date: 09/29/1986
From: Booker J
GULF STATES UTILITIES CO.
To: Harold Denton
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737 GL-82-33, RBG-24481, NUDOCS 8610090193
Download: ML20210T789 (2)


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GULF STATES UTILITIES COMPANY RIVER BEND STATION POST OFFICE BOX 220 ST. FRANCISVILLE LOUISIANA 70775 AREA CODE 504 635 6094 346-8651 September 29, 1986 RBG 24481 File G9.5, G9.33.4 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. c. 20555

Dear Mr. Denton:

River Bend Station-Unit 1 Docket No. 50-458 Gulf States Utilities (GSU) is providing herein followup information on two items from Generic Letter 82-33, Supplement I related to Emergency Response Facilities. The first is a status on the River Bend Station (RBS) Safety Parameter Display System (SPDS) and Digital Radiation Monitoring Systems (DRMS). The second item revises the list of variables monitored by the SPDS.

Gulf States Utilities (GSU) has completed its testing of the SPDS and DRMS as discussed in its February 28, 1986 letter to your office and as required by Generic Letter 82-33, Supplement 1 to NUREG-0737 -

" Requirements for Emergency Response Capability".

Both of these systems are currently functional. While performing base line testing for the Digital Radiation Monitoring System (DRMS) data base and associated algorithms capabilities, GSU determined that several enhancements could be made which would significantly improve the DRMS emergency offsite dose projection computer capabilities. These enhancements are expected to improve the capabilities in the areas of calculating fission product content change with time; selection and use of manual / automatic parameter input for accident scenarios; use of automatic parameter input during drill and exercises; and output ,_

format for dose projection information. These enhancements are not expected to be completed until the end of 1987. As noted in FSAR Table 13.3-16, the_ backups to the automated dose assessment system of DRMS are manual dose assessment method (e.g.

programmable calculator and/or isopleths) which are currently in place. Therefore, GSU currently has redundant capabilities to perform offsite dose projection calculations.

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8610090193 860929 PDR ADOCK 05000458 l O F PDR I

Mr. Denton September 29, 1986 In GSU's May 15, 1985 letter to your office regarding the SPDS, Table 1 identified SPDS monitored variables. Under Containment Integrity, the varieble of containment /drywell laydrogen concentration was listed in error. The RBS SPDS design is consistent with the SPDS function of the General Electric (GE) approved Emergency Response Information System (ERIS) as described in NEDE-30284-P dated November 1983. The GE SPDS displays were addressed in NRC's GESSAR-2 SSER-4, Appendix G.

Included as part of the SSER review were the basic containment and drywell parameters monitored by the SPDS. The containment /drywell hydrogen concentration parameter was not included in the GESSAR-2 parameters to be monitored. The NRC's SSER-4 conclusions stated that the parameters selected for the GE SPDS would be acceptable with the addition of radiation monitors to show the status of the Radioactivity Control Function which is included in the RBS DRMS. Therefore, GSU concludes that the RBS SPDS monitored variables are consistent with the GE SPDS displays without the containment /drywell hydrogen concentration variable as listed in Table 1 of GSU's May 15, 1985 letter.

Sincerely, f..

J f. Booker E.

Manager-River Bend Oversight River Bend Nuclear Group JEB/ k/ER je 1

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