ML17209A314

Lists Concerns Re Design & Operating Features Contribution to or Detraction from Safe Plant Response to Complete Loss of Ac Power.Requests Analysis of Safe Control of Facility During Total Loss of Ac Power

ML17209A314
Person / Time
Site:	Saint Lucie
Issue date:	10/10/1980
From:	Eisenhut D Office of Nuclear Reactor Regulation
To:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
References
ALAB-603, NUDOCS 8011060228
Download: ML17209A314 (12)

Text

Docket No. 50-335 gt'Iy ~ 0880 Dr. Robert E. Uhrig, Vice President Advanced Systems 8 Technology Florida Power 8 Light Company Post Office Box 529100 hiiami, Florida 33152

Dear Dr. Uhrig:

The NRC Atomic Safety and Licensing Appeal Board in its Decision, ALAB-603, issued on July 30, 1980, required that the licensee perform and submit an analysis demonstrating the ability of St. Lucie Unit No.

2 to be safely contro'lied through the total loss of ac power.

In addition, the Board required that the licensee document and submit to the NRC its training programs and procedures for operation during the total loss of ac power and for restoration of ac power.

St. Lucie Unit No.

2 design and operating features are discussed in ALAB-603 regarding their contribution to or detraction from safe plant response to a complete loss of ac power.

Concerns regarding these features, some yet to be resolved for Unit No. 2, which are applicable to Unit No.

1 include:

the adequacy of stored transferrable secondary coolant inventories the desirability of using atmospheric steam dump valves for steam flow control the in'tegrity of RCP seals following loss of component cooling the availability of instrumentation and lighting the existence of an ac power independent AFt< pump and flow path the need for periodic testing of diesel generators power Regulatory Guide 1.108 the status of primary coolant letdown following loss of all ac power the need for limitipg conditions of operation to reduce the length of time of reactor power operation when a combination of power sources and systems required for safe shutdown are out, of service the existence of emergency procedures and operator training to deal with loss of all.ac power.

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~ R Dr. Robert E.'hrig Florida Power 8 Light Company The transient, total loss of ac power, is being reviewed generically for operating reactors such as St. Lucie Unit No.

1.

Continued operation during this. review has been found acceptable based on the capability to provide, independent of ac power, auxiliary feedwater to cool the reactor coolant system.

In addition St. Lucie Unit No.

1 has recently experienced a loss of component cooling water to the RCP's, for about 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />, with no signs of RCP seal degradation.

Nevertheless, based on our knowledge of the St. Lucie

'nit Ho.

1 design and its operation we believe that the probability of a total loss of ac power is no lower than for Unit No.

2 and the Unit No.

1 design is not better equipped to be safely controlled through this transient than is.the Unit No.

2 design.

He conclude that the Unit No.

2 requirements of ALAB-603 are appropriate for St. Lucie Unit No.

1.

Therefore, pursuant to 10 CFR 50.54(f) you are requested to submit an analysis demonstrating the ability of St. Lucie Unit No. 1, modified as necessary, to be safely controlled through a total loss of ac power.

Any modifications orr operational changes determined necessary as a result of this analysis should be identified and implementation schedules proposed.

You are also requested to describe in detail the training programs and procedures for station operation during a total loss'f ac power and for restoration of ac power, as developed based on your analysis.

The staff expects this analysis could be completed in about 6 months.

You are requested to submit your schedule for providing the information requested above within 20 days of the date of this letter.

In addition, based on your review of the areas of concern regarding design and operating features addressed in ALAB-603, some of which are discussed in paragraph 3 above, you'ay identify changes to St. Lucie Unit No.'

which should be impTemented prior to completing the subject analysis.

You are requested to report such changes as well as implementation schedules within 30 days of the date of this litter.

All information above is requested pursuant to 10 CFR 50.54(f), to enable the Commission to determine whether or not the St. Lucie Unit No..

1 license should be modified, suspended or revoked.

DISTRIBUTION Docket NSIC" NRC PDR HRDenton Local PDR EGCase ORB ¹3 Reading DRoss

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Dr. Robert E. Uhrig Florida Power 8 Light Company The transient, total loss of ac power, is being reviewed generically for operating reactors such as St. Lucie Unit Ho. 1.

Continued operation during this review has been found acceptable based on the capability to provide, independent of ac power, auxiliary feedwater to cool the reactor coolant system.

In addition St. Lucie Unit No.

1 has recently experienced a loss of component cooling water to the RCP's, for about 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />, with no signs of RCP seal degradation.

Nevertheless, based on our knowledge of the St. Lucie Unit No.

1 design and its operation we believe that the probability of 444s-Q 4~os-ien5 is no plower than for Unit No. 2 and the Unit No.

1 design is not better equipped to be safely controlled through this transient than is the Unit No.

2 design.

We conclude that the Unit Ho.

2 requirements of ALAB-603 are appropriate for St. Lucie Unit Ho. l.

Therefore, pursuant to 10 CFR 50.54(f) you are requested to submit an analysis demonstrating the ability of St. Lucie Unit Ho. 1, modified as necessary, to be safely controlled through a total loss of ac power.

Any modifications or operational changes determined necessary as a result of this analysis-'Should t

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You are.'also requested to describe in detail the training programs and procedures for station operation during a total loss of ac power and for restoration of ac power, as developed based on your analysis.

The staff expects this analysis could be completed in about 6 months.

You are requested to submit your schedule for providing the information requested above within 20 days of the date of this letter.

In addition, based on your review of the areas of concern regarding design and operating features addressed in ALAB-603, some of which are discussed in paragraph 3 above, you may identify changes to St. Lucie Unit No.

1 which should be implemented prior to completing the subject analysis.

You are requested to report such changes as well as implementation schedules within 30 days of the date of this letter.

All information above is requested pursuant to 10 CFR 50.54(f), to enable the Commission to determine whether or not the St. Lucie Unit No. l,license should be modified, suspended or revoked.

Sincerely, PBaranowsky cc:

See next page

• SEE PREVIOUS YELLOW.

FOR CONCURRENCES Darrell G. Eisenhu, Director Division of Licens ng DISTRI BUT ION NS IC FSchroeder Docket ORBII3 Reading HRDento

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t UNITEDSTATES I NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 October 10, 1980 Docket No. 50-335 Dr. Robert E. Uhrig, Vice President Advanced Systems 5 Technology Florida Power E Light Company Post Office Box 529100 Miami, Florida 33152

Dear Dr. Uhrig:

The NRC Atomic Safety and Licensing Appeal Board in its Decision, ALAB-603, issued on July 30, 1980, required that the licensee perform and submit an analysis demonstrating the ability of St. Lucie Unit No.

2 to be safely controlled through the total loss of ac power.

In addition, the Board required that the licensee document and submit to the NRC its training programs and procedures for operation during the total loss of ac power and for restoration of ac power.

St. Lucie Unit No.

2 design and operating features are discussed in ALAB-603 regarding their contribution to or detraction from safe plant response to a complete loss of ac power.

Concerns regarding these features,'some yet to be resolved for Unit No. 2, which are applicable to Unit No.

1 include:

the adequacy of stored transferrable secondary coolant inventories the desirability of using atmospheric steam dump valves for steam flow contr ol the integrity of RCP seals following loss of component cooling the availability of instrumentation and lighting the existence of an ac power independent AFW pump and flow path the need for periodic testing of diesel generators per Regulatory Guide 1.108 the status of primary coolant letdown following loss of all ac power the need for limiting conditions of operation to reduce the length of time of'eactor power operation when a combination of power sources and systems required for safe shutdown are out of service the existence of emergency procedures and operator training to deal with loss of all ac power.

~Dr. Robert E. Uhrig Florida Power 5 Light Company The transient, total loss of ac power, is being reviewed generically for operating reactors such as St.

Lucie Unit No.

1.

Continued operation during this review has been found acceptable based on the capability to provide, independent of ac power, auxiliary feedwater to cool the reactor coolant system.

In addition St. Lucie Unit No.

1 has recently experienced a loss of component cooling water to the RCP's, for about 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />, with no signs of RCP seal degradation.

Nevertheless, based on our knowledge of the St. Lucie Unit No.

1 design and its operation we believe that the probability of a total loss of ac power is no lower than for Unit No.

2 and the Unit No.

1 design is not better equipped to be safely controlled through this transient than is the Unit No.

2 design.

We conclude that the Unit No.

2 requirements of ALAB-603 are appropriate for St. Lucie Unit No. l.

Therefore, pursuant to 10 CFR 50.54(f) you are requested to submit an analysis demonstrating the ability of St. Lucie Unit No. 1, modified as necessary, to be safely controlled through a total loss of ac power.

Any modifications or operational changes determined necessary as a result of this analysis should be identified and implementation schedules proposed.

.You are also requested to describe in detail the training programs and procedures for station operation during a total loss of ac power and for restoration of ac power, as developed based on your analysis.

The staff expects this analysis could be completed in about 6 months.

You are requested to submit your schedule for providing the information requested above within 20 days of the date of this letter.

In addition, based on your review of the areas of concern regarding design and operating features addressed in ALAB-603, some of which are discussed, in paragraph 3 above, you may identify changes to St.

Lucie Unit No.

1 which should be implemented prior to completing the subject analysis.

You are requested to report such changes as well as implementation'chedules within 30 days of the date of this letter.

All information above is requested pursuant to 10 CFR 50.54(f), to enable the Commission to determine whether or not the St. Lucie Unit No.

1 license should be modified,'uspended or revoked.

Sincerely, Darre G.

fsen u

i ecto Division o Licensing cc:

See next page

Fl orida Power I oht Compa np'C'obert Ldwenstein, Esquire Lowenstein,

kewman, Reis '6 Axelrad 1025 Connecticut

Avenue, H.M.

1'ashington, D.C.

20036 Horman A. Coll, Esquire l1cCarthy, Steel, Hector 8 Davis 14th Floor, First Mati'onal Bank Building Niami, Fl ori da 33131 Indian Fiver Junior College Library 3209 Virginia nvenue Fort Pierce, Florida 33450 Administra or D partmen of Environmental Regulation Power Plant Si.ing S ction S.ate of Fl orida 2600 Blair Stone Road Tallahassee, Florida 32301 Vr. 'Vel don B.

Lewi s Coun v Administrator S:.

Luci e Coun:y 2300 Virginia.'venue, Roc'04 Fort Pierce, Florida 33450 Hr. Jack Shreve

, Office of the Public Counsel Room 4, Holland Bldg.

Tallahassee, Florida 32304 Bureau of Intergovernm ntal Rel ati ons 660 Apa1 achee Parkway Tallahassee, Florida 32304 Resident Inspector/St.

Lucie l'luclear Power Station c/o U.S.fs.R.C P,O.

Box 400 Jensen

Beach, Florida 33457 Director, Technical Division Office 07 Radiation (Aii'-~ - o )

U.

S.

Env-i ron~n.a 1

Crystal Yia 1 1

~2 Arling-on, Yirgin)a Assessment Programs rro- >" -'o" 'c~""v 20460 U. S.

Environmental Protection Agency Region IY Office ATTti':

EI S COORD! )J-'.TGR 345 Courtl and S'tree:,

t,'. E.

Atlan a, Georc i a 3030S

.'<1. Charl es 8 ~ "rinkman t'iana e

- 4ashin"ton nuclear Operations C-E Power Systems Col bustion n inee ing, In".

4-53 Coi Qell Ave iue, Suite n-1 5

hesda, t'ia yland 20014

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