ML19351A664

Application for Amend to License DPR-40,revising Tech Spec Sections 2.0 & 3.0 to Specify Administrative Controls Used to Prevent RCS Overpressurization Transients

ML19351A664
Person / Time
Site:	Fort Calhoun
Issue date:	08/01/1977
From:	Short T OMAHA PUBLIC POWER DISTRICT
To:
Shared Package
ML19351A663	List: ML19351A662 ML19351A664 ML19351A665
References
NUDOCS 8912200327
Download: ML19351A664 (10)

Text

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Q*[a BEPCRE '!WE UNITED STAM EUCLEAR RBOULA*0RY C0000S310R la the Matter of )

OgWIA PtR' SIC POWER DIS'!EICT ) incket No. 50-265 (Port Calhoun Station, )

. Unit No. 1) )

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M d.. APPLICATIOR TOR AMENDIEDl?

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' pj ;. Pursuant to Section $0.90 of the regulations of the U. 8. Realeer W'.

93 Reguintory Commission ("the Commaission"), Canha Public Power Distriet.

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@ holder of Pacility Operating' License No. DPR h0, herewith requeste that d.

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Sections 2.0 and 3.0 of the Tet.hnical Specifications set forth ta Appendia

'.g h,.g"c - A to that Liessee be amended te. specify adaimistrative eestrois used to eq These gi prevent Teactor coolantwsystes, everpressuriaation tr---dents.

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,, ( preposed Technical Specifications are submitted in response to a letter.

h dated J oe 28, 1977. receive,4 from O. lear U, 8. Nuclear Regulatory 3

y canaission.

s.,1 x The reoposes changes in Teehateal Specifications are set forth la .

,y Attachment A to this AggMeaties. A discussica, which aanmatrates that , ,

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the proposed changes da act involve aisafficant baserte cons &dersticas. **

&, to appended in AttatAaeet 3. the proposed changes la spesiftenticas~..'.4...A

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..' he types or angr inerease in the ascents 'g.

g'see16 act subhertse any change in - MC$ c .,

pT of efflusats se ray thange in the authorised power level of the fam

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iy WHEREFORE, Applicant respectfuuy requests that Sections 2.0 and 3 0 t

of Appendix A to Facility Operating License No. DPR ko be amended la the fers attached hereto as Attmekmont A.

4 E WIAEA PUBuc PodER DISTRICT I

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,/, Division 80maagar -

.* .. Proemeties Operations ammasener.emmeseen Jan0MEL.WD3Nr

. , topte m tae,tes,ad. test i

b,, Subscribed and sworn to before se v a

- this e Y day of /.$ se / , 1977.

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Notary Public /

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PORT CALHOUN STATION UNIT NO. 1 LOW TEMPERATURE OVERPRESSURE PROTECTION SYSTEN

• RBQUEST FOR INFORMATION

y. ) st o _1 - Monitoriter ATAcross Steam Generatort 3 hts pla n t spec 1 tic analysis assumed a 50* h1 between the primary and secondary coolant systens. Please discusses (1) how this br will be nonitored and (2) what coat,tois will be used to 21ait the reactor coolant pump (ac9) starts te er < 50* conditteast Resoonse No.-1

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~*. 'The District has designed a monitoring system which will measure

" the feedwater temperature in each steam generator and compare it wit 2r the reactor coolant system cold leg temperature. This aya-cc' tem will function by draining steam generator feedwater through j

the blowdown system and past temperature elements: one per steam t generator.- Provisions will be made to ensure that the measured h temperature accurately reflects steam generator temperature and N'

annunciation will be provided for AT greater than 500P. Insta11-ation of this' permanent system is scheduled for the 1977 refuel-ing outage.

'l In the event tant material procurement problems prohibit 1977

' installation c.f tne permanent system, thermocouples will be in- _

t stalled on the steam generator shell or secondary-site handholes.

6 Calculations have shown that response time of this system will 4 be sufficiently rapid to allow reasonably accurate determination of steam generator feedwater temperature. This method is oon-4 e sidered to be temporary until receipt of materials allowa in-y, sta11ation of the permanent system.

Operation of reactor coolant pumps relative to the 50er at limitation will be in accordance with the proposed Technical

" specification 2.1.1 and corresponding cperating Instreetions.

C s moquest se. # - 2se2atles Fa2We 42aree d.; j s .; y .

Ja'your analysis yem stated the low temperature overpressere pro  ;-

%t tection system wt22 ' met be fully operatieaal natia two oposts g the first eveat is the enabling of the pressste "y PA have occurred.

operated relief valve (PoaFJ 2ew pressere setpotat, the asesed . . ,

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~t event is opening the upstream isekatiea seawe. Et is the statt*s p

, ,( positJem that the alara whfeb Jaddeates the need for low tempera- J -

l ture everpressure protectica abou2d met clear matta the 80&F Jew 5;'.'pressere setposat is enabled and the Ase2aties waive la spee. '

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(92 ease diseems what steps wA22 be taken to fasure that the Jew ;Y

[temperatore metrefat and the asekation patre positten are wired j

. .together to esaffre that 2ew temperature overpressure proteetdos iv$a availab2e. , 3

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1. nasoonse No. 2 yi Annunciation wjil be provided on control room pans 1 CB-1/2/3 to indicate closure of either PORV isolation valve. This 7 s A.@

?7 alarm willA not clear until schematic both of this isolation system valvesinhave is shown been the attached opened.

Figure 3.

.a , _ Reevest No. 3 - Sustee insta21ations nn -

D in your analysje you state that the overpressurisation protectica J system will be installed at the nest refue2 LayWeoutage, cetober woeld Jake te

'%r 2977, provided that equipment .mauary is available.

22, 2977 requested yea to

_ $ /g>! reatnd you that our letter of to a schedule for the installation of acceptable Reap tera Q' commit improvement by December 32, 2977.

I hesoonee No. 3 The District is aware of this position, and all possible steps are beint taken to ensure installation by December 31, 1977.

nequest no. 4 - ponv stain sesarakt 24 tu s me plant specific report shows one variab2eIn setpotat suitek order te meet

!. O and one hi-Jow reset switch for both pomre.

the requirements of separabilley of circuits, it is the staff's position that these PonVs should each have a variabJe setpotat

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% mus, the staff betiewee switch and a be there should hi-tow reset switch.

two separate keylocked esteette, one ter coek pens.

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Response No. 4 l

the proposed low setpoint PORY actuation system will be auto-antica11y onebled when cold leg temperature is below 3000F and

$y pressuriser ressure low si 1 (PPL8) has been seed. tbs oommon var le setpoint reset evitches have eliminatet and ocaplete separation of both channels is now maintained.

7 t The attached Figure 1 details the circuitry for PORT PCV-103-1.

A stallar, separate system will be provided for PCV-102-2.

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paesse subale detailed eirente sekeesties and aesto diegreen i

et the everpressure proteettoa system.

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):l The attacheA Figures 1 through S detail the preliminary cidealtat scheastics and control layout for the overpressere geotectica~

The following important features are incorporated &ato g;

k gten.e desigan the low setpotat ciroeitry is estcoatically enabled when 1)' 4 preeserteer, pressere 10e signai (9958) is tapessed and h$

3 Response No. 5 (Continued) .

oold leg temperature is below 3600F (contact TCl).

2) A key-operated reset switch isOnce necessary to return the the low setpoint is system to the high setpoint.

enabled, it seals in.

3) A key-operated switch is provided to allow manual open-While this switch would by-1%g or closing of a PORV.

pass the automatic opening circuitry, it would not by ing pass the low setpoint enabling circuitry. Hanual clos

. of a PORV is annunciated in the control room.

4) Enabling or actuation of the' low setpoint circuitry for

.h( one PORV automatically enables or actuates the circuitry

't *for the second PORV.

p 5) Once the low setpoint circuitry has been enabled, an in-crease in RCS pressure above the low setpoint automatically opens the PORY (contact Rl) .

6) Annunciatilon is provided if either PORV selector switch

(switches 2 and 3) is placed in the test position.

Request No. 6 - PoRV Valve cyclines y]*

at what rate does the PoRY cyeZe? Please discuss the eaPabilities Y

et the PORVa under repeated cycling. Can the 50RVs servive opettas

at the bienest rate for 20 afautesP Response No. 6

^ The low-temperature overpressure protection system is desigasd sash b that, following low setpoint actuation of a p0RV reolosure of i .-

C the 50-100 PORY pai. would not take place until system pressere is re80ste bythis

• PORY eyeling, with the result that eyeling of a 7089 any be treated as a series of individual openings.

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neeueet so. 7 - seismie and rass # Pts Dese itses were met etearly addressed da the plaat speedfie aeport. katify aZZ deviations La the eostros etreetter troe' .

y 8888 319 and seisale erteeria. . ,

paspense no. 7

~ The proposed control circuitry oosplies fully with .1 EBB 279 criteria and is designed as a emissie Class I system.

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@gs please discuss the treguency and type of testing that wA22 be .

? meed te determine the eendition et the everpressure proteetion system. It is the statt's positica tha t t (2) the FORF esatro2 etreuitry and pressure detection senser shenad be tested prier to each use of the overprossure protection systcm. and (3) the PORVs shouJd be stroked duriny each refueling.

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% Response No. 8 LW ..

f,% The following surveillance program is proposed for the low set-Nk  : q. .

point PORV actuation system:

4 W' 1) The enabling and' actuation circuitry will be tested prior

-t to each scheduled oold leg cooldown below 3000F and monthly 7

,whenever the temperature is below 3000F and the reactor

. vessel head is installed. A test switch mounted in the

-- '4 control room (one per channel) will supply an 'open" sig-

• O nal to the actuation circuitry. Proper operation will be i verified by supervisory and indication lights. See the o attached, Figures 1 and 2 for schematics.

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,,: 2) .The temperature and pressure channels will be onlibrated

.. each refueling.

2 S 3) The PORVs will be operated each refueling in accordance

- ,7 with the District's in-service inspection program.

.'[r aeeuest no. t- wennice2 eneestiestions s

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O sa pour ama2ysis it was stated that various overpressariaaties M scenaries would be Jiatted by adelaistrative eostre2. It is the

%l esatt*a positten that when adalaistrative eentrole are need to

,Q 22att everpresserisation seenarios, these adotatatrettee eentre2a p should appear la the Behaisa2 speef tications as &inittag Coaditions e for operaties (&cos) . typtea2 &cos whien gom abomad seasider '<..

r'.~ &aeloding La the 9ett Caaneen habeleaa speettieetione are em - .

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e. 81sab2ing mem-esseattaa systems (e.g., peeps, aseeme2atoes er',

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_, $l:~N o. Raintaining presseriser bebbae as hoog as possible. , _. a f, 'l,., ,

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E d4 saab22mg of the overpressere preteettoa states. " ,, . , _

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Dettap 80RF and eostrol etteettry.

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i Preposed Technical Specifications are imeluead with this corse = Q ,,

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