ML20151C852
| ML20151C852 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 07/11/1988 |
| From: | Eury L CAROLINA POWER & LIGHT CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| Shared Package | |
| ML20151C855 | List: |
| References | |
| NLS-88-131, NUDOCS 8807220205 | |
| Download: ML20151C852 (12) | |
Text
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'caronne Power a ueht compeg P. o. Box 1551
- Ralesh N. C. 27602 JUL 11 1988 SERIAL: NLS-88-131 LYNN W. EURY senkw yk:e Prescent 10CFR50.90
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- 88TSB09 United States Nuclear Regulatory Commission ATTENTION: Document Control Desk Washington, DC 20555 LRUNS'JICK STEAM ELECTRIC PIANT, UNIT NO. 1 DOCKET NO. 50-325/ LICENSE NO. DPR-71 REQUEST FOR LICENSE AMENDMENT ATWS-RPT INSTRUMENTATION Gentlemen:
In accordance s the Code cf Federal Regulations, Title 10, Parts 50.90
.n and 2.10'., Carolina Power & Light Company (CP&L) hereby requests a revision to the Technical Specifications (TS) for the Brunswick Steam Electric Plant (BSEP), Unit 1.
The proposed Changes incorporate revised instiument numbers in Tables 3.3.6.1-1, 3.3.6.1-2, and 4.3.6.1-1, and revise Technical Specification 3.3.6.1 to reflect. the new anticipated transient without scram (ATWS) recirculation pump trip (RP1) logic.
These inodifications will be performed during the upcoinir; Unit i refueling outage currently seneduled to begin on November 12, 1988. provides a detailed ^ scription of the proposed changes and the basis for the changes.
EncI
-re 2 details the basis for the Company's determination that the proposed changes do not involva a significant hazards consideration. provides instructions for incorporation of the proposed changes into the Technical Specifications. provides a summary of the proposed Technical Specification changes on a page by page basis. provides the proposed Technical Specification pages for Unit 1.
In accordance with the requirements of 10CFR170.12, a check for $150 is also enclosed.
By letter dated September 29, 1987, CP&L submitted a l'. cense amend:nent request to install the name rodification on BSEP Unit 2.
This requnsted{
amendment was subsequently appreved by the NRC and issued as Amendment d'
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' Document Control Desk NLS-88-131 / Page 2 Number-150 on April 8, 1988. IAwever,.that amendment request was noticed for orior hearing, as detailed in an NRC letter dated _0ctober 27, 1987, because the proposed amendment was considered too complex to permit a preliminary no significant hazards consideration determination to be ir. ado.
An environmental ascessment with a fir. ding of no significant impact.was published on April 7, 198d in the Federal Register. The modifications being performed and the Techniul Specifications enclosed herein are identical-to those desccibed, submitted and approved for Unit 2.
This amendaent is required to support changes being made during the BSEP-1 refueling outage currently scheduled to begin on November 12, 1988.
Therefore, CP&L requests that the amendment be issued no later than December 30, 1988 t o support start up from the outage.
Please refer any questions regarding thii submittal to Mr. Stephen D. FloyJ nt (919) 836-6901.
Yours very truly,
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W. Eury BAB/bab L. W. Eury, having been first duly sworn, did depose and say that the information contained harein is true and correct to the best of his information, knowledge and belief; and the sources of his information are officers, employees, contractors, and agents of Carolina Power & Light Compary.
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Basis for Change Request
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10CFR30.92 Evaluation
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Instructions for Incorporation 4.
Summary List of Revisions 6
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Technical Specification Pages cc:
Mr. Dayne H. Brown Dr. J. Nelson Graco Mr. W. H. Ruland Mr. E. D. '"ylves ter
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4 ENCLOSURE 1 BRUNSWICK STEAM ELECTRICJPIl_NT, UNIT'1' NRC DOCKET NO. 50-325 OPERATING LICENSE NO.:DPR 71--
REQUEST FOR LICENSE AMENDMENT
'ATWS-RPT INSTRUMENTATION BASIS FOR CHANGE REOUEST The existing action statements and tables associated with Technical-Specification.3.3.6.1 represent the current one;out-of two trip logic design of the BSEP ATWS-RPT' system. The one-out-of-two trip logic design is shown in Figure 1.
Each pump has a single trip system with four channels; two of which are. level transmitters, and two are pressure transmitters A Eignal from any one of the four channels.would cause the associated recirculation pump to trip.
This type of logic can lead to spurious recirculation pump trips upon malfunction of a' single instrument.
To decrease the likelihood of spurious pump trips and increase the reliability of the ATWS-RPT cystem, CP&L intends to do two things:
(1)
Modify the recirculation pump trip logic from one-out-of-two to two - out - o f-two, and (1)
Replace the existing digital pressure instrumentation with analog.
instrumentation.
Each of these actions is described in Proposed Change Numbers 1 and 2.
respectively.
El-1
Proposed Change Number 1 Modify the recirculation pump trip logic from one-out-of-two to two out-of-two.
Basis The two-out-of two logic configuration is shown in Figure 2.
The're are two trip systems, each consistir.g of four channels; two pressure and two level transmitters, just as.there are in the one-out-of-two trip logic, hswever, with the two-out-of-two trip' logic, a signal from either trip system will trip both pumps as opposed to just one, and it will take a s gnal from either both level transmitters or both pressure transmitters
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in a given trip system to cause the pump to trip.
By requiring two signals from the same' type of instrument, the possibility of spurious pump trips due to a single malfunctioning instrument should-be reduced, thereby reducing the potential for an unnecessary transient.
The existing wording of the action statements associated with Technical Specificttion 3.3.6.1 represent the one-out-of-two trip logic. Action Statement (a) will continue to apply to the two-out of-two trip. logic; however, Action Statement (b) must be revised to identify.the different combinations of operable and inoperable instrumentation possible in a two-out-of two trip logic system.
The revised Action Statement (b) provides the necessary actions to be taken if one channel in a trip system is inoperable.
New Action Statement (c) provides the necessary actions to be taken if more than one channel in a trip system is inoperable. Action Statements (d) and (e) provide the necessary actions to be taken when one or both trip systems are inoperable.
The additional action statements are necessary to address the possible configurations associated with the two-out-of-two logic.
Table 3.3.6.1 1 currently requires that at least~one instrument channel per trip system be operable at all times.
This requirement is being revised to reflect that, in the two-out-of-two. system, at least two instrument channels per trip sys cem must be operable 'at -all times.
Footnotes (a) and (b) provide clarity and reinforce the action statements provided for Technical Specification 3.3.6.1-1.
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1 Pronosed Channe umber 2-Replace the existing digital pressure instrumentation with analog instrumentation.
Basis The Company plans to. replace the existing digital reactor vessel pressure switches in the ATWS-RPT system with an analog pressure transmitter / master trip unit configuration. The analog pressure transmitters and master trip units are more accurate and do not exhibit the calibration drift characteristics inherent.in the existing pro.sure
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switches. General Electric Licensing Topical Report'NEDO-21617-A, "Analog Transmitter /. rip Unit System for Engineered Safeguard Sensor Trip' Inputs," dated December 1978. includes the Staff letter dated June 27, 1978, which-approved.the use of analog equipment.
The instrument tag. numbers provided in' Item 2 of Tables 3.3.6.1-1, 3.3.6.1-2 and 4.3.6.1-1 are being revised to'show the pressure transmitters, represented by the PT notation, and the master trip units, represented by the PTM notation.
Previously, only one designation, PS, was necessary to represent the pressure switches.
The surveillance frequencies provided for.the new analog instrumentation are consistent with those required for other analog configurations.
The analog trip units vill be tested on the same schedule as the existing digital pressura switches with the addition of a daily channel check-that is not performed on the existing equipment.
This modification will enhance the reliability of the ATUS-RPT-system by providing a more accurate and reliable indication of reactor vessel pressure. This, in conjunction with the logic modification, will.
further decrease the probability of a spuriouc recirculation pump' trip due to malfunction'of an instrument, d
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ENCLOSURE 2 BRUNSVICK STEAM ELECTRIC PIANT, UNIT 1 NRC DOCKET 50-325 OPERATING LICENSE DPR-71 REQUEST FOR LICENSE AMENDMENT ATWS-RPT INSTRUMENTATION 10CFR50.92 EVALUATION The Commission has provided standards in 10CFR50.92(c) for determining' whether a significant hazards consideration exists.
A proposed amendment to an operating license for a facility involves no significant hazards consideration if operation of the f.cility in accordance with the proposed amendment would not: (1) involve a significant increase in the probability or consequences of an accident previously evaluated, (2) create the possibility of a new or different kind of accident from any accident previously evaluated, or (3) involve a significant reduction in a margin of safety.
Carolina Power & Light Company has reviewed this proposed license amendment request and determined that its adoption would not involve a significant hazards consideration.
Proposed Chance Number 1 Modify the recirculation pump trip logic from one-out-of-two to two-out-o f - two.
Basis The change does not involve a significant hazards consideration for the following reasons:
1.
The revised action statements provided for Technical Specification 3.3.6.1 and minimum number of channels required to be operable listed in Table 3.3.6.1-1 reflect a design change which will enhance reliability of the RPT system and reduce the number of spurious recirculation pump trips caused by a single malfunctioning instrument.
The revised action statements describe the actions to be taken if instruments, channels, or trip systems are inoperable.
The change to the minimum numb.er of channels required to be operable reflects a change in logic from one-out-of-two to two-out-of-two, which leads to fewer spurious pump trips and hence, fewer unnecessary transients.
The action statements have been revised to accomplish essentially the same objecrive as the existing action statements for a new, more reliable, logic configuration.
They continue to ensure that proper corrective measures are taken in a timely manner should any part of the instrumentation become inoperable.
These actions are consistent with the guidance provided in the GE BWR-4 Standard Technical Specifications.
E2-1
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The modified ATWS RPT system will provide additional assurance'
.that_the recirculation pumps will trip when necessary, The modified systemcwill also provide' assurance that;the pumps will not trip unnece::sarily and thereby initiate a plant. transient situation..Since plant transients may act as initiators to accidents, reducing-the potential for.a trantient should reduce the possibility ~of'an accident. Therefore, the proposed change does not cause an increase in the probability of an accident.
~
The ATWS-RPT system mitigates the. consequences of an ATWS event, If the pumps do not trip in.an ATWS eventL the consequences-of.the evenc'are worsened. Therefore, by increasing the reliability of the ATWS-RPT system and thereby increasing the likelihood that the recirculation pumps will trip when necessary, the consequences of an A1WS event will be reduced.
2.
The AIVS-RPT system is a mitigative system; i.e.,
it causes the recirculation pumps to trip in response-to a signal indicating an ATWS avent is taking place as opposed to initiating.some type of
~
event.
By-increasing the reliability of the ATWS RPT function, the potential-for. mitigation of an ATWS event is enhanced.
No other accident situations are affected, andi no new accidents could be initiated by the enhanced ATWS-RPT logic. The.only accide nts/ transients affected. are. the ATWS event, whose l
consequences are improved by the logic change, and the tripping of i
one or both the recirculation pumps, which are previously analyzed conditions. Thus, no new accident situations are created.
3.
The logic change.will result in fewer spurious recirculation pump trips due to a single malfunctioning instrument and'will enhance i
the reliability of the ATVS-RPT system. The instrumentation will ultimately provide at least the same amount of protection as the.
existing instrumentation; i.e.,
the reci culation pumps will trip on signals from reactor vessel water level and/or reactor vessel.
pressure. Therefore, the margin of safety is not reduced.
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Proposed Chanze Number 2 q
Replace the existing digital pressure instrumentation with analog-instrumentation.
Basis-The change does not involve a significant hazards consideration for the following reasons:
1.
Replacing the existing digital reactor vessel pressure switches with an analog pressure transmitter / master trip unit configuration will result in increased system reliability. General Electric Licensing Topical Report NEDO-21617-A, dated December, 1978, describes the analog transmitter / trip unit system for engineered safeguards sensor trip input.
The analog pressure transmitters and master trip units are more accurate and do not exhibit the calibration drift. characteristics inherent in the existing digital pressure switches.
The proposed surveillance schedule for the analog instrumentation will ensure' equipment operability and is consistent with.the required test frequencies for other analog equipment. -In addition, the analog configuration is functionally equivalent to the existing digital components. Therefore, the digital-to-analog instrumentation modification cannot cause an increase in the probability of any accident, nor can it cause a change in the consequences of an accident.
2.
The proposed modification will enhance the ATWS-RPT system reliability and improve system performance.
The digital-to-analog instrumentation change provides a more accurate and reliable sensing system.
It does so in essentially the same manner as I
before; only with a new, more accurate instrument.
Therefore, the proposed change does not create the possibility of a new or.
different type of accident.
3.
The replacement of the existing digital instrumentation with analog equivalents provides a.more reliable means of tripping both recirculation pumps under ATWS conditions.
Operability of the ATWS-RPT system is assured through the surveillance requirements provided in Table 3.3.6.1-3.
The surveillance requirements for the new instruments provide at least the same operability assurance as the existing requirements.
Therefore, the margin or safety is not reduced.
E2-3
ENCLOSURE 3 BRUNSWICK STEAM ELECTRIC PLANT, UNIT 1 NRC DOCKET NO. 50-325 OPERATING LICENSE NO. DPR-71 REQUEST FOR LICENSE AMENDMENT ATWS-RPT INSTRUMENTATION INSTRUCTIONS FOR INCORPORATION The proposed changes to the Technical Specifications (Appendix A to Operating License DPR 71) would be incorporated as follows:
UNIT 1 Remove Page Insert Page V
V 3/4 3-79 3/4 3-78 3/4 3-78a 3/4 3-79 3/4 3-79 3/4 3-80 3/4 3-80 3/4 3-81 3/4 3-8*
i E3-1
ENCLOSURE 4 BRUNSWICK STEAM ELECTRIC PIANT, ' UNIT 1 NRC DOCKET NO 50-325 OPERATING LICENSE NO. DPR-71 REQUEST FOR LICENSE AMENDMENT ATWS-RPT INSTRUMENTATION
SUMMARY
LIST OF REVISIONS UNIT 1 Pages Descriotion of Chances V
Revise the title.of Item 3/4.3.6 from "ATWS Recirculation Pump Trip System Instrumentation" to "ATWS Recirculation Pump Trip (RPT) System Instrumentation."
3/4 3-78 Revise the title of Item 3/4.3.6 from "ATWS Recirculation Pump Trip System Instrumentation" to "ATWS Recirculation Pump Trip (RPT) System Instrumentation," correct the system designation
-in Technical' Specification 3.3.6.1 and Action-Statement (a), change "trip system" to "instrument channel" in. Action Statement (b),
revise Action Statement (b) and add new Action Statements (c), (d),'and (e), correct the system designation,' replace "trip. system"-with "channel" and the reference to Table 4.3.6.1.1-1 i
with~a reference to Table 4.3.6.1-1 in Surveillance Requirement 4.3.6.1.1.
j 3/4 3-78a Added to accommodate additions on Page 3/4'3-78.
3/4 3-79 Revise column heading "Minimum. Number Operable Trip Systems Per Operating Pump".to "Minimum.
I Number Instrument Channels Per Trip. System,"
replace the "and" with ";" in Item 1, revise the minimum number of channels from 1 to 2 in Items 1 and 2, revise instrument numbers in Item 2, and add footnotes (a) and (b).
3/4 3-80 Revise instrument numbers in Item 2.
3/4 3-81 Replace "and" with ";" in Item 1, revise the instrument numbers in Item 2 and-add new surveilla. ice requirenents.
E4 1
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