ML20198N327: Difference between revisions

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#REDIRECT [[AECM-86-163, Provides Addl Info to 860321 Proposed Change PCOL-86/04 to License NPF-29 Re Mods to Automatic Depressurization Sys Per BWR Owners Group Evaluation of NUREG-0737,Item II.K.3.18. Info Clarifies Changes Made to Sys Initiation Circuitry]]
| number = ML20198N327
| issue date = 05/30/1986
| title = Provides Addl Info to 860321 Proposed Change PCOL-86/04 to License NPF-29 Re Mods to Automatic Depressurization Sys Per BWR Owners Group Evaluation of NUREG-0737,Item II.K.3.18. Info Clarifies Changes Made to Sys Initiation Circuitry
| author name = Kingsley O
| author affiliation = MISSISSIPPI POWER & LIGHT CO.
| addressee name = Denton H
| addressee affiliation = NRC OFFICE OF NUCLEAR REACTOR REGULATION (NRR)
| docket = 05000416
| license number =
| contact person =
| case reference number = RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.18, TASK-TM
| document report number = AECM-86-0163, AECM-86-163, TAC-61039, NUDOCS 8606060048
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE, UTILITY TO NRC
| page count = 2
}}
 
=Text=
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MISSISSIPPI POWER & LIGHT COMPANY
                        ]                             Helping Build Mississippi Eull&liddiddE          P. O. B O X 16 4 0. J A C K S O N. MISSISSIPPI 39215-1640 May 30, 1986 O. D. KINGSLEY, JR.
vaCE PRESIDENT - NUCLEAR OPERAYiONS U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Washington, D. C.                20555 Attention: Mr. Harold R. Denton, Director
 
==Dear Mr. Denton:==
 
==SUBJECT:==
Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-29 Additional Information PCOL-86/04 AECM-86/0163 Mississippi Power & Light (MP&L) Company submitted a proposed char.ge to Facility Operating License NPF-29 in a letter from Mr. O. D. Kingsley, Jr. to Mr. Harold R. Denton dated March 21, 1986.                  Item 3 of the March 21, 1986 letter proposed changes to the technical specifications needed to implement modifications to the Automatic Depressurization System (ADS) in accordance with Option 4 of the BWR Owners' Group evaluation of NUREG-0737, Item II.K.3.18 (License Condition 2.C(33)(f)).
In the justification section for the proposed technical specification changes, MP&L stated that once the bypass timer times out, the bypassing of the high drywell pressure would be sealed in and the bypass timer would not automatically reset. This statement concerning the proposed design was correct at the time of the March 21, 1986 letter. However, recent modifications to this design by General Electric will result in the removal of this seal-in so that once the RPV level is recovered above Level 1, the bypass timer is reset and, in the event the ECCS Pumps are tripped, the logic is completely reset to terminate the automatic initiation of ADS. This change is an enhancement to the originally proposed design and is being made to help prevent inadvertent automatic ADS initiations after the first ADS initiation. This change to the ADS system does not affect the proposed changes to the technical specifications in the March 21, 1986 letter but is being provided to clarify the changes being made to the ADS initiation circuitry.
If there are any questions, feel free to contact this office.
Yours    ly, 8606060048 860530                    o PDR      ADOCK 0500
                                                                -    .            4, ODK:lm                                                                                      /
cc:      (See Next Page)                                                                  -
Oh J10AECM86052701A - 1 Member Middle South Utilities System                                      8{0
 
t AECM-86/0163 '
Page 2 cc: Mr. T. H. Cloninger Mr. R. B. McGehee Mr. N. S. Reynolds Mr. H. L. Thomas Mr. R. C. Butcher Mr. James M. Taylor, Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta St., N. W., Suite 2900 Atlanta, Georgia 30323 J10AECM86052701A - 2}}

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