ML20215L345

Proposed Tech Specs Revising Leak Detection Setpoints for RWCU & Rcic/Rhr Sys

ML20215L345
Person / Time
Site:	River Bend
Issue date:	06/18/1987
From:	GULF STATES UTILITIES CO.
To:
Shared Package
ML20215L327	List: ML20215L345 RBG-26202, Application for Amend to License NPF-47,changing Leak Detection Setpoints for RWCU & Rcic/Rhr Sys.Fee Paid
References
NUDOCS 8706260017
Download: ML20215L345 (7)

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i ATTACHMENT 2 j GULF STATES UTILITIES COMPANY RIVER BEND STATION  ;

' DOCKET 50-458/ LICENSE NO. NPF-47 {

i RCIC/RHR HICH FLOW ISOLATION ACTUATION INSTRUMENTATION SETPOINTS

)

LICENSING DOCUMENT INVOLVED: TECHNICAL SPECIFICATIONS {

l ITEM: Table 3.3.2-2 PAGE: 3/4 3-22 l REASON FOR CHANGE (

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Technical Specification Table 3.3.2-2 Item 5.1 spv.ifies the trip setpoint and allowable value for the RHR/RCIC Steam Line Flow - High instrumentation at $156" H0 and $164.5"H0,respectively. The applicablenotestatesthatthks,isaninitialsetpoint and the final  !

setpoint is to be determined during startup testing. A previous l Technical Specification Change submitted on April 12, 1986 revised this  ;

note to say the final setpoint is to be determined upon approvc1 to j operate in the steam condensing mode. This change revises the initial  !

trip setpoint' and allowable values of item 5.1 to ( 60.7" H 0, 2 and

$64.2"H0,respectively,withareferencetotheappl1Eblenote.

2 i'

DESCRIPTION The RCIC/RHR high flow instruments are part of the leak detection system )

originally specified by the General Electric Company. This portion of )

the system consists of two Divisional instrument loops each having a {

flow measuring isolation actuation instrumentation elbow meter. l differential pressure transmitter and master and slave trip unit. Each l Divisional instrument loop provides for automatic isolation of the l RCIC/RHR isolation valves for that division (i.e. 1E51*MOVF064 and F031 j in Div. I ' and 1E51*MOVF063 and F076 in Div. II) and control room j annunciation. A high flow condition creating a differential pressure  ;

exceeding the established setpoint causes an automatic isolation of the i assumed downstream line break.

As a r6sult of a review of the RCIC/RHR steam line high flow setpoint, l it us determined that a correction to the technical specification  !

initial trip setpoint and allowable value was required. The . error  !

resulted from an incorrect application of RHR and RCIC steam flow rates {

and the use of a formula for converting flow rate to elbow meter  !

differential pressure. This condition was only applicable to the l RCIC/RHR steam line flow setpoint. l t

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'SIGNIFICANT HAZARDS CONSIDERATION j As discussed in 10CFR50.92, the following discussions are provided to the NRC Staff in suppcrt of "no significnat hazards considerations". l 1

1. No significant increase in the probability or the consequences of an j accident previously evaluated results from this change because:

The . trip setpoint and allowable values are based on an analytical limit equivalent to 125 percent of the maximum steady state flow.

The maximum steady state flow is the combined flow of steam to the i RHR system while in the steam condensing mode (both A & B Loops) plus the flow of steam to the RCIC turbine. This would be the normal lineup after approximately 30 minutes of steam condensing operation. The trip setpoint and allowable values are adjusted below the analytical limit to allow for instrument and calibration accuracies and instrument drift. The setpoint is established high enough to preclude spurious isolations due to normal operational flows, yet low enough to isolate on postulated break flows of downstream piping.

The decrease in the RCIC/RHR steam line flow-high setpoint reduces the consequences of a steam line break in the RCIC/RHR steam supply lines. The main steam line double ended break is the design basis accident for offsite dose consequences.

2. This change would not create the possibility of a new or different kind of accident from any accident previously evaluated because:

The originally specified trip setpoint of $156" H2 O is equivalent  ;

to a flow rate which is below the break flow for an eight inch RHR steam line break but may not have been low enough to isolate on a four inch RCIC steam line break. The proposed setpoint will isolate on both the four and eight inch line breaks for downstream piping. i The function of the RCIC/RHR steam line high flow instrumentation remains the same. The $60.7" H 0 trip setpoint will enable the instrument loop to detect and isolate a double ended line break downstream. This was the intended function as originally designed. i

3. This change would not involve a significnat reduction in the margin of safety because:

The setpoint is being lowered in the conservative direction. There can only be an increase in the margin of safety associated with this setpoint change.

REVISED TECHNICAL SPECIFICATION As indicated above, River Bend Station is currently in compliance with the applicable Technical Specification. The proposed change is provided in the Enclosure.

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-NOTIFICATIONbF.STATEPERSONNEL

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'3; .ALeopy of the amendment' application and-this submittal has been provided to,the State of Louisiana, Department of Environmental Quality - Nuclear Energy Division.

I

ENVIRONMENTAL IMPACT APPRAISAL 3

Revision;;of this Technical: Specification 'does not . result in an -

environmental ' impact. beyond that _ previously analyzed. . Therefore,.an  !

-approval. of this amendment does not result- in- -a significant' environmental ' impact- nor does it change any previous environmental  :

impact statements for River Bend Station.  !

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