ML17216A206

Advises That Util Will Respond to Reg Guide 1.97 Open Items by 850705,per 850425 Ltr

ML17216A206
Person / Time
Site:	Saint Lucie
Issue date:	05/15/1985
From:	WILLIAMS J W FLORIDA POWER & LIGHT CO.
To:	MILLER J R Office of Nuclear Reactor Regulation
References
RTR-REGGD-01.097, RTR-REGGD-1.097 L-85-195, TAC-51135, TAC-51136, NUDOCS 8505210335
Download: ML17216A206 (20)

Text

/REGULATORY FORMATION DISTRIBUTION S EM (RIOS)ACCESS IOA NBR;8505210335 DOC, DATE: 85/05/15 FACIL:50-335 St.Lucie Plantr Unit 1<Florida 50;389 St, lucio Plantr Unit 2, Florida AUTH~NAME AUTHOR AFFILIATION WILLIAMS~J.W.F l or i da Power tt Light Co, REC1P~NAME RECIPIENT AFFILIATION MILLER',R~Operating Reactors Branch NOTARIZED>>

NO Power tt Light Co Power tt light'o, 3 DOCKET 05000335 05000389

SUBJECT:

Advises that u.til will respond<<to Reg Guide 1.97 open items" by 850705rper 850425 ltd DISTRIBUTION CODE: A003D COPIES RECEIVED:LTR ENCl SIZK;TITLE!OR/Licensing Submit,tall Suppl 1 to NUREG~0737(G neric Ltr 82 33)NOTES>>Ol'2/01/76 OL;04/06/83.

05000335 05000389 RECIPIENT IO CODE/NAME NRA ORB3 BC INTERNAL;ADM/LFMB NRR PAULSONpW NRR/OHFS/PSRB NRR/DL/ORB5 NRR/DSI/I CSB NRR/DSI/RAG EXTERNAL: LPDR NSIC COPIES lTTR ENCL 2 5 1 1 RECIPIENT ID CODE/NAME NRR ORB3 BC IK/DEPER/EPB NRR/DHFS/HFEB NRR/DL/ORAB NRR/DS I/CPB NRR/OS I/MKTB NRR/OS I/RSB RGN2 NRC~POR COPIES LTTR ENCL'OTAL NUMBER OF COPIES REQUIRED>>LTTR 42 ENCL

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Mr.James R.Miller, Chief Operating Reactors Branch No.3 Division of Licensing U.S.Nuclear Regulatory Commission Washington, D.C.20555

Dear Mr.Miller:

Re: St.Lucie Unit Nos.I and 2 Docket Nos.50-335 and 50-389 Conformance to Regulatory Guide l.97, Revision 2 (NRC TAC Nos.5I l35&5l l36)H Florida Power and Light Company's schedule for responding to the Regulatory Guide l.97 open items identified in your letter of April 25, l 98$, is July5, l 985.Very truly yours, J.W.Williams, Jr.Group Vice President Nuclear.Energy JWW/R JS/cab 85052i0335 850515 PDR ADOCK 05000335 F PDR o>>I D PEOPLE...SERVING PEOPLE It May 9, 1985 Docket Nos.50-335 and 50-389 Mr.J.W.Williams, Jr.Vice President Nuclear Energy Department Florida Power 8 Light Company P, 0.Box 14000 Juno Beach, Florida 33408

Dear Mr.Williams:

DISTRIBUTION:

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SUBJECT:

DRAFT TECHNICAL EVALUATION REPORT (TER)FOR SALEM ATWS ITEM 1.2 (GENERIC LETTER 83-28)Re: St.Lucie Plant, Unit Nos.182 The staff has completed a preliminary review to assess the completeness and adequacy of licensee responses to Generic Letter 83-28 Item 1.2.For the St.Lucie Plant, Unit Nos.1 8 2, your response was found to be incomplete in four of the areas evaluated..

The enclosed TER provides a technical evaluation representing the staff's initial judgment of the areas evaluated.

Pen and ink changes have been made to the TER by your project manager to make the wording consistent with our approach.In order to preserve our present review schedule, we would appreciate your cooperation in obtaining additional information that will permit us to complete our review.It would appear that the needed information on your facility could be obtained by telephone conference within one week of your receipt of the DRAFT TER.Your project manager will be working with you to arrange an acceptable time to conduct the necessary conference calls.OMB clearance is not required since the information needs for each plant vary.Sincerely,

Enclosure:

DRAFT TER on Salem ATWS Item 1.2 James R.Miller, Chief Operating Reactors Branch¹3 Division of Licensing cc w/enclosure See next page ORB¹3:J3L euCzer/g/85 OR¹3:DL DES lls:dd 5//85:DL Miller//85 I I t 1 h~I II M rF O W h I'll I II I SAIC-85/$525-10 REYIEW OF LICENSEE AND APPLICANT RESPONSES TO NRC GENERIC LETTER 83-28 (Required Actions Based on Generic Implications of Salem ATWS Events), Item 1.2,"POST-TRIP REYIEW: DATA AND INFORMATION CAPABILITIES" FOR ST.LUCIE PLANT, UNITS 1!2 (50-335, 50<<389)Technical Evaluation Report Prepared.by Science Applications International Corporation 1710 Goodridge Drive NcLean, Virginia 22102 Prepared for U.S.Nuclear Regulatory Commission Washington, D.C.20555 Contract No.NRC-03-82-096 FOREWORD This report contains the'technical evaluation of the St.Lucie Plant, Units 1S2 response to Generic Letter 83-28 (Required Actions Based on Generic Implications'f Salem ASS Events), Item 1.2"Post Trip Review: Data and Information Capabilities." For the purposes of this evaluation,.

the review criteria, presented in part 2 of this report, were divided into five separate categories.

These are: 1.'he parameters monitored by the sequence of events and the time history recorders, 2.The performance characteristics of the sequence of events recorders, 3.The performance characteristics of the time history recorders, 4.The data output format, and 5.The long-term data retention capability for post-trip review material.n All available responses to Generic Letter 83-28 were evaluated.

The plant for which this report is applicable was found to have adequately responded to, and met, category 2.~~C~~The report describes the specific methods used to determine he cate-gorization of the responses to Generic Letter 83-28.Since this valuation report was intended to apply to more than one nuclear power plan specifics regarding how each plant met (or failed to meet)the are not presented.

Instead, the evaluation presents a categorization of the responses according to which categories of are satisfied and which are not.The evaluations are based on pecific criteria (Section 2)derived from the requirements as stated in the generic letter.

TABLE OF CONTENTS Section Introduction.

Page~~~~~~~~~~~~~~~1 1.Background.

~~~~~~~~~~~~~~~2 2.Revie~Criteria.~~~~~~~~~3 3.Evaluation.

~~~~~~~~~~~~~~~8 4.Conclusion.

5.-References.

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'INTRODUCTION SAIC has reviewed thesubmittals.prepared in response to Generic Letter 83-28, item 1.2"Post-Trip Review: Data and Information Capability".

The submittalS(see references) contained, sufficient information to determine that the data and information capabilities at this plant are acceptable in the following area.o The sequence-of-events recorder(s) performance charac-teristics.

However, the data and information capabilities, as described in the submittal, either fail to meet the review criteria or provide insufficient information to allow determination of the adequacy of the data and information capabilities in the following areas.o The parameters monitored by both the sequence-of-events and time history recorders.

e The time history recorder(s) performance characteris-tics.o The output format of the recorded data.o The long-term data retention, record keeping, capa-bil i ty.

1.Background

On February 25, 1984, both of the scram circuit breakers at Un~t 1 of the Salem Nuclear Power Plant failed to open upon an automatic reactor trip signal from the reactor protection system.This incident occurred during the plant startup and the reactor was tripped manually by the operator about 30 seconds after.the initiation of the automatic trip signal.The failure of the circuit breakers has been determined to be related to the sticking of the under voltage trip attachment.

Prior to this incident;on February 22, 1983;at Unit 1 of the Salem Nuclear Power Plant an automatic trip signal was generated based on steam generator low-low level during plant startup.ln this case the reactor was tripped manually by the operator almost coinci-dentally with the automatic trip.At that time, because the utility did not have a requirement for the systematic evaluation of the reactor trip, no investigation was performed to determine whether the reactor was tripped automatically as expected or manually.The utilities'ritten procedures

.required only that the cause of the trip be determined and identified the responsible personnel that could authorize a restart if the cause of the trip is known.Following the second trip which"'learly indicated the problem with the trip breakers, the question was raised on whether the circuit breakers had functioned properly during the earlier incident.The most useful source of information in this case, namely the sequence of events printout which would have indicated whether the reactor was tripped automatically or manually during the February 22 incident,'as not retained after the incident.Thus, no judgment on the proper functioning of the trip system during the earlier incident could be made.Following these incidents; on February 28, 1983;the NRC Executive Director for Operations (EDO), directed the staff to investigate and report on the generic implications of these occurrences at Unit 1 of the Salem Nuclear Power Plant.'he results of the staff's inquiry'nto the generic implications of the Salem Unit incidents is reported in NUREG-1000,"Generic Implications of ATMS Events at the Salem Nuclear Power Plant." Based on the results of this study, a set of required actions were developed and included in Generic Letter 83-28 which was issued on July 8, 1983 and sent to all licensees of operating reactors, applicants for operating license, and construction permit holders.The required actions in this generic letter consist of four categories.

These are: (1)Post-Trip Review, (2)Equipment Classification and Yender Interface, (3)Post Haintenance Testing, and (4)Reactor Trip System Reliability Improvements.

The first required action of the generic letter, Post-Trip Review, is the subject of this TER and consists of action item 1.1"Program Description and Procedure" and action item 1.2"Data and Information Capability." In the next section the review critqria used to assess the adequacy of the utilities'espon'ses to the requirements of action item 1.2 will be discussed.

2.Review Criteria The intent of the Post Trip Review requirements of Generic Letter 83-28 is to ensure that the licensee has adequate procedures and data and information sources to understand the causd knd progression of a reactor trip.This understanding should go beyond a simple identification of the course of the event.It should include the capability to determine the root cause of the reactor trip and to determine whether safety limits have been exceeded and if so to what extent.Sufficient information about the reactor trip event should be available so that a decision on the acceptability of a reactor restart can be made.The following are the review criteria developed for the requirements of Generic Letter 83-28, action item 1.2: The equipment that provides the digital sequence of events (SOE)record and the analog time history records of an unscheduled shutdown should pro-vide a reliable source of the necessary information to be used in the post trip review.Each plant variable which is necessary to determine the cause(s)and progression of the event(s)following a plant trip should be monitored by at least one recorder/such as a sequence-of-events recorder or a plant process computer for digital parameters; and strip charts, a plant process computer or analog recorder for analog (time history)variabl esp Each device used to record an analog or digital plant variable should be described in sufficient detail so that a determination can be made as to whether the following performance characteristics are met:

o Each sequence-of-events recorder should be capable of detecting and recording the sequence of events with a sufficient time discrimination capability to ensure that the time responses asso-ciated with each monitored safety-related system can be ascer-tained, and that a determination can be made as to whether the time response is within acceptable limits based on , FSAR Chapter 15 Accident Analyses.The recommended guideline for the SOE time discrimination is approxi-mately 100 msec.If current SOE recorders do not have this time discrimination capability the licensee or applicant should show that the current time discrimination capability is sufficient for~an adequate reconstruction of the course of the reactor trip.As a minimum this should include the ability to adequately recon-struct the accident scenarios presented in Chapter 15 of the plant FSAR.o Each analog time history data recorder should have a sample inter-val small enough so that the incident can be accurately reconstructed following a reactor trip.As a minimum, the licensee or applicant should be able to reconstruct the course of the accident sequences evaluated in the accident analysis of the'lant FSAR (Chapter 15).The recommended guideline for the sample interval is 10 sec.If the time history equipment does not meet this guideline, the licensee or applicant should show that the current time history capability is sufficient to accurately recon-struct the accident sequences presented in Chapter 15 of the FSAR.o To support the post trip analysis of the cause of the trip and the proper functioning of involved safety related equipment, each analog time history data recorder should be capable of updating and retaining information from approximately five minutes prior to the trip until at least ten minutes after the trip.o The information gathered by the sequence-of-events and time history data collectors should be stored in a manner that will allow for retrieval and analysis.The data may be retained in either hardcopy (computer printout, strip chart output, etc.)or in an accessible memory (magnetic disc or tape).This information should be presented in a readable and meaningful format, taking into consideration good human factors practices (such as those outlined in NUREG-0700).

'o All equipment used to.record sequence of events and time history information should be powered from a reliable and non-interruptible power source.The power source used need not be safety-related.

The sequence of events and time history recording equipment should monitor sufficient digital and analog parameters, respectively, to assure that the course of the reactor trip can be reconstructed.

The parameters monitored should provide sufficient information to determine the root cause of the reactor trip, the progression of the reactor trip, and the response of the plant parameters and systems to the reactor trip.Specifically, all input parameters associated with reactor trips, safety in5ections and other safety-related systems as well as output parameters sufficient to record the proper functioning of these systems should be recorded for use in the post trip review.The parameters deemed necessary, as a minimum, to perform a post-trip review (oneSthat would determine if the plant remained within its design envelope)are presented on Tables 1.2-1 and 1.2-2.If the appli-cants'r licensees'OE recorders and time history recorders do not monitor all of the parameters suggested in these tables the applicant or licensee should show that the existing set of monitored parameters are sufficient to establish that the plant remained within the design envelope for the appro-priate accident conditions; such as those analyzed in Chapter 15 of the plant Safety Analysis Report.Information gathered during the post trip review is required input for future post trip reviews.Data from all unscheduled shutdowns provides a valuable reference source for the determination of the acceptability of the plant vital parameter and equipment response to future unscheduled shut-downs.It is therefore necessary that information gathered during all post trip reviews be maintained in an accessible manner for the life of the plant.5 Table 1.2-1.PAR Parameter List SOE Recorder Time History Reco'rder Parameter Si nal (1)x x (1)x x (1)x x (2)(1)x (1)x (1)x (1)x (1)x (3)x x (1)x (1)x (1)x (3)x Reactor Trip Safety Infection Containment Isolation Turbine Trip Control Rod Position Neutron Flux, Power Containment Pressure Containment Radiation Containment Sump Level Primary System Pressure Primary System Temperature Pressurizer Level Reactor Coolant Pump Status Primary System Flow Safety In).;Flow, Pump/Valve Status HSIV Position Steam Generator Pressure Steam Generator Level Feedwater Flow Steam Flow Auxiliary Feedwater System;Flow, Pump/Value Status AC and DC System Status (Bus Voltage)Diesel Generator Status (Start/Stop, On/Off)PORV Position (1.): Trip parameters (2): Parameter may be monitored by either an SOE or time history recorder.(3): Acceptable recorder options are: (a)system flow recorded on an SOE recorder, (b)system flow recorded on a time history recorder, or (c)equipment status recorded on an SOE recorder.

Table 1.2-2.BMR Parameter List SOE Recorder Time History'ecorder Parameter/Signal x x (1)x (I)(2)x (1)(2)x (1)x (1)x x (1)(3)x (1)x (1)(3)(4)Reactor Trip Safety Injection Containment Isolation Turbine Trip Control Rod Position Neutron Flux, Power Hain Steam Radiation Containment (Dry Hell)Radiation Drywell Pressure (Containment Pressure)Suppression Pool Temperature Primary System Pressure Primary System Level HSIY Position Turbine Stop Valve/Control Valve Position Turbine Bypass Valve Position Feedwater Flow Steam Flow Recirculation; Flow, Pump Status Scram Discharge Level Condenser Vacuum AC and DC System Status (Bus Voltage)Safety In)ection; Flow, Pump/Valve Status Diesel Generator Status (On/Off, Start/Stop)

(1): Trip parameters.

(2): Parameter may be recorded by either an SOE or time history recorder.(3): Acceptable recorder options are: (a)system flow recorded on an SOE recorder, (b)system flow recorded on a time history recorder, or (c)equipment status recorded on an SOE recorder.(4): Includes recording of parameters for all applicable systems from the following:

MPCI, LPCI, LPCS, IC, RCIC.

3.Evaluation The parameters identified in part 2 of this report as a part of the review criteria are those deemed necessary to perform an adequate post-trip review.The recording of the'se parameters on equipment that meets the guidelines of the review criteria will result in a source of information that can be used to determine the cause of the reactor trip and the plant response to the trip, including the responses of important plant systems.The parameters identified in this submittal as being recorded by the sequence of events and time history recorders do not correspond to the parameters specified in part 2 of this report.The review criteria require that the equipment being used to record the sequence of events and time history data required for a post-trip review meet certain performance characteristics.

These characteristics are intended to ensure that, if the proper parameters are recorded, the record-ing equipment will provide an adequate source of information for an effec'-tive post-trip review.The information provided in this submittal does not indicate that the time history equipment used would meet the intent of the performance criteria outlined in part 2 of this report.Information supplied in the submittal does indicate that the SOE equipment meets the performance criteria specified in part 2 of this report.The data and information recorded for use in the post-trip review should be output in a format that allows for ease of identification and use of the data to meet the review criterion that calls for information in a readable and meaningful format.The information contained in this submittal does not indicate that this requirement is met.The data and information used during a post-trip eview should be retained as part of the plant files.This information uld prove useful during future post-trip reviews.Therefore, one is that infor-mation used during a post-trip review be maintained in an accessible manner for the life of the plant.The information contained within this submittal does not indicate that this criterion will be met.

4.Conclusion The information supplied in response to Generic Letter 83-28 in8icates that the current post-trip review data and information capabilities are adequate in the following area: 1.The sequence of events recorders meet the minimum performance requirements.

The information supplied in response to Generic Letter 83-28 does not indicate that the post-trip review data and infor~ation capabilities are adequate in the following areas.1.Based upon the information contained in the submittal, all of the parameters specified in part 2 of this report that should be recorded for use in a post-trip review are not recorded.2.Time history recorders, as described in the submittal, do not meet the minimum performance characteristics.

3.As described in the submittal, the recorded data may not be output in a readable and meaningful format.4.The data retention procedures, as described in the submittal, do not indicate that the information recorded for the post-trip review is maintained in an accessible manner for the life of the plant.It is possible that the current data and information capabil'ities.at this t pd d<<1 1<<p but were not completely described.

Under these circumstances, the licensee should provide an updated, more complete, description to show in more detail the data and information capabilities at this nuclear power plant.If the information provided accurately represents all current data and information capabil ties, then the licensee should either show that the data and informa-tion capabilities meet the intent of the criteria in part 2 of this report, or detail future modifications that would enable the licensee to meet the intent of the evaluation criteria.

~~REFERENCES NRC Generic Letter 83-28."Letter to all licensees of operating reactors, applicants for operating license, and holders of construction permits regarding Required Actions Based on Generic Implications of Salem ATHS Events.=" July 8, 1983.NUREG-1000, Generic Implications of ATMS Events at the Salem Nuclear Power Plant, April 1983.Letter from J.M.Mil 1 iams, Jr., Florida Power and Light, to D.G.Eisenhut, NRC, dated November 8, 1984, Accession Number 8311110156 in-response to Generic Letter 83-28 of July 8, 1983, with attachment.

10 SUPPORTING DOCUMENT FOR TELECON St.Lucie 1 and 2 1.Parameters recorded: Unsatisfactory 2.See attached.table for discrepancies.

SOE recorders performance characteristics:

Satisfactory Unit 1 sequence of events recorder: 2msec time discrimination with a non-interruptible power supply Unit 2 sequence of events recorder: 1msec time discrimination with a non-interruptible power supple 3-.Time hi story recorders performance characteristics:

Unsatisfactory SAS (TEC Corp.computer);

sample interval of between 1 and 60 secs for the period from 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> before to 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> after the trip with non-interruptible power supply Strip charts: power 1"/hr rate, continuous monitoring and non-interruptible 4.Data output format: Unsatisfactory SOE output includes time of event, sensor ID, and an event descriptor.

Time history output includes time, parameter name and value for the strip charts;the TEC computer output is not specified.

5.Data retention capability:

Unsatisfactory Strip chart data is retained sometimes for life of plant, sometimes not at all.

Required PWR Parameters for Post Trip Review (circled parameters are not recorded)SOE Recorder Time History Recorder Parameter/Si nal x (I)x x (I)x x (I)x.x (2)(I)(3)(I)x (I)x (I)x (I)x (4)x x (I)x (I)x (I)x (4)Reactor Trip Safety Injection Containment Isolation Turbine Trip Control Rod Position Neutron Flux, Power Containment Pressure Containment Radiation Containment Sump Level Primary System Pressure (Vessel Pressure, Pressurizer Pressure)Primary System Temperature Pressurizer Level Reactor Coolant Pump Status Primary System Flow Safety Inj.;Flow, Pump/Valve Status MSIV Position Steam Generator Pressure Steam Generator Level Feedwater Flow Steam Flow Auxiliary Feedwater System;Flow, Pump/Value Status AC and DC System Status Diesel Generator Status PORV Position (I): Trip parameters; pressurizer or primary pressure is a trip parameter (depending on plant).2): Parameter may be monitored by either an SOE or time history recorder.3): Acceptable recorder options are: (a)reactor vessel pressure recorded on both an SOE and time history recorder, or (b)pressurizer pressure recorded on both an SOE and time history recorder.(4): Acceptable recorder options are: (a)system flow recorded on an SOE recorder, (b)system flow recorded on a time history recorder, or (c)equipment status recorded on an SOE recorder.