NRC Generic Letter 1985-03: Difference between revisions

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{{#Wiki_filter:1__.-.. e t norl* A-dIudry 1Y o TO ALL BOILING WATER REACTOR LICE SEES AND APPLICANTS
{{#Wiki_filter:1__.-..   e   t norl
Gentlemen:
SUBJECT: CLARIFICATION
OF EQUIVALENT
CONTROL CAPACITY FOR STANDBY LIQUID CONTROL SYSTEMS (Generic Letter 85-03)3 Paragraph (c) (4) of 10 CFR 50.62 states, in part: Each boiling water reactor must have a standby liquid control system (SLCS) with a minimum flow capacity and boron content equivalent in control capacity to 86 gallons per minute of 13 weight percent sodium pentaborate solution.The "equivalent in control capacity" wording was chosen to allow flexibility in the implementation of the requirement.


For example, the equivalence can be obtained by increasing flow rate, boron concentration or boron enrichment.
* A-dIudry            1Y      o TO ALL BOILING WATER REACTOR LICE SEES AND APPLICANTS
  Gentlemen:
  SUBJECT:  CLARIFICATION OF EQUIVALENT CONTROL CAPACITY FOR
              STANDBY LIQUID CONTROL SYSTEMS (Generic Letter 85-03)
  3 Paragraph (c) (4) of 10 CFR 50.62 states, in part:
        Each boiling water reactor must have a standby liquid control system (SLCS) with a minimum flow capacity and boron content equivalent in control capacity to 86 gallons per minute of
        13 weight percent sodium pentaborate solution.


The 86 gallons per minute and 13 weight percent sodium pentaborate were values used in NEDE-24222, "Assessment of BWR Mitigation of ATWS, Volumes I and II," December 1979, for BWR/4, BWR/5 and BWR/6 plants with a 251 inch vessel inside diameter.
The "equivalent in control capacity" wording was chosen to allow flexibility in the implementation of the requirement. For example, the equivalence can be obtained by increasing flow rate, boron concentration or boron enrichment.


That different values would be equivalent for smaller plants was recognized in NEDE-24222:
The 86 gallons per minute and 13 weight percent sodium pentaborate were values used in NEDE-24222, "Assessment of BWR Mitigation of ATWS, Volumes I and II,"
The flow rates given here are normalized from a 251-inch-diameter vessel plant to a 218-inch-diameter vessel plant, i.e., the 66 GPM control liquid injection rate in a 218 is equivalent to 86 GPM in a 251. This is done to bound the analysis...(pp.
  December 1979, for BWR/4, BWR/5 and BWR/6 plants with a 251 inch vessel inside diameter. That different values would be equivalent for smaller plants was recognized in NEDE-24222:
        The flow rates given here are normalized from a 251-inch-diameter vessel plant to a 218-inch-diameter vessel plant, i.e., the 66 GPM control liquid injection rate in a 218 is equivalent to 86 GPM in a 251. This is done to bound the analysis...(pp. 3-12)
  The important parameters to consider in establishing equivalence are vessel boron concentration required to achieve shutdown and the time required to achieve that vessel boron concentration. The minimally acceptable system should show an equivalence in these parameters to the 251 inch diameter vessels studied in NEDE-24222.


3-12)The important parameters to consider in establishing equivalence are vessel boron concentration required to achieve shutdown and the time required to achieve that vessel boron concentration.
There are no reporting requirements associated with this generic letter.


The minimally acceptable system should show an equivalence in these parameters to the 251 inch diameter vessels studied in NEDE-24222.
Sincerely, Original signed by Darrell G. EisenhUt Darrell G. Eisenhut, Director Division of Licensing Office of Nuclear Reactor Regulation OELD       144 VWShields ORAL                           1/23/85/
 
  ORAMA                               :DL       A E                 D
There are no reporting requirements associated with this generic letter.Sincerely, Original signed by Darrell G. EisenhUt Darrell G. Eisenhut, Director Division of Licensing Office of Nuclear Reactor Regulation OELD 144 VWShields ORAL 1/23/85/ORAMA :DL A E D TAlexb m. JHannon Holahan DCru chfield D X nhn$ u 1/10 1/13/85 1/t0 /85 1/1(/85 1 ,/85 t5oh74oe633}}
  TAlexb     m.   JHannon         Holahan       DCru chfield       D   X nhn$u
  1/10           1/13/85       1/t0 /85       1/1(/85             1 ,/85 t5oh74oe633}}


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Latest revision as of 03:45, 24 November 2019

NRC Generic Letter 1985-003: Clarification of Equivalent Control Capacity for Standby Liquid Control Systems
ML031150576
Person / Time
Issue date: 01/02/1985
From: Eisenhut D
Office of Nuclear Reactor Regulation
To:
References
GL-85-003, NUDOCS 8501290633
Download: ML031150576 (1)
v • d • e


1__.-.. e t norl

  • A-dIudry 1Y o TO ALL BOILING WATER REACTOR LICE SEES AND APPLICANTS

Gentlemen:

SUBJECT: CLARIFICATION OF EQUIVALENT CONTROL CAPACITY FOR

STANDBY LIQUID CONTROL SYSTEMS (Generic Letter 85-03)

3 Paragraph (c) (4) of 10 CFR 50.62 states, in part:

Each boiling water reactor must have a standby liquid control system (SLCS) with a minimum flow capacity and boron content equivalent in control capacity to 86 gallons per minute of

13 weight percent sodium pentaborate solution.

The "equivalent in control capacity" wording was chosen to allow flexibility in the implementation of the requirement. For example, the equivalence can be obtained by increasing flow rate, boron concentration or boron enrichment.

The 86 gallons per minute and 13 weight percent sodium pentaborate were values used in NEDE-24222, "Assessment of BWR Mitigation of ATWS, Volumes I and II,"

December 1979, for BWR/4, BWR/5 and BWR/6 plants with a 251 inch vessel inside diameter. That different values would be equivalent for smaller plants was recognized in NEDE-24222:

The flow rates given here are normalized from a 251-inch-diameter vessel plant to a 218-inch-diameter vessel plant, i.e., the 66 GPM control liquid injection rate in a 218 is equivalent to 86 GPM in a 251. This is done to bound the analysis...(pp. 3-12)

The important parameters to consider in establishing equivalence are vessel boron concentration required to achieve shutdown and the time required to achieve that vessel boron concentration. The minimally acceptable system should show an equivalence in these parameters to the 251 inch diameter vessels studied in NEDE-24222.

There are no reporting requirements associated with this generic letter.

Sincerely, Original signed by Darrell G. EisenhUt Darrell G. Eisenhut, Director Division of Licensing Office of Nuclear Reactor Regulation OELD 144 VWShields ORAL 1/23/85/

ORAMA :DL A E D

TAlexb m. JHannon Holahan DCru chfield D X nhn$u

1/10 1/13/85 1/t0 /85 1/1(/85 1 ,/85 t5oh74oe633

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