ML20205A288

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Rev 1 to EOP 578, Reactor Pressure Vessel Emergency Procedure
ML20205A288
Person / Time
Site: Millstone, Haddam Neck, 05000000
Issue date: 03/20/1984
From: Mccollum W, Palmer R
CONNECTICUT YANKEE ATOMIC POWER CO.
To:
Shared Package
ML20204H467 List: ... further results
References
EOP-578, NUDOCS 8810250454
Download: ML20205A288 (13)
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1 E.J. Mroczka 8-25-83

  • Form Approved by Station Superintendent Effective Date STATION PROCEOURE COVER SHEET A. IDENTIFICATION .

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Number E0P 578 Rev. 1 ,

Title RPV Floodina Emeroency Procedure Prepared By W. R. McCollum .

8. REVIEW I have reviewed the above procedure and have four.d it to t,e satisfactory.

TITLE SIGNATURE DATE DEPARTMENT HEAD kb- -

4Sf39 hM/ htW

,, b b, 2//o/N C. UNREVIEWED SAFETY QUESTION EVALUATION DOCUMENTATION REQUIRED:

(Significant change in procedure method or scope as described in FSAR) YES [ g NO ( ]

)

(If yes, document in PORC/50RC meeting minutes)

ENVIRONMENTAL IMPACT (Adverse environmental impact) YES ( ) NO C (If yes, document in PORC/SORC meeting minutes)

D. PROCEDURE REQUIRES PORC/SORC REVIEW YES [ NO [ ] l E. PORC/SORC APPROVAL SORC Me1*.1Pg Number ,_ 48N~O l F. APPROVAL AND IMPLEMENTATION  !

The attached procedure is hereby approved, and effective on the date below: i

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<& f. 2* fy Station / Service /U6t Superintendent Effective Date ,

SF-301 Rev. 6 .

O Eia19256454 081007 i fpR ADOCK 05000213 p PDR i

nry riccaing tv sie reva 2 Rev. 1 Unit 1 (N P.PV Flooding Emergency Procedu;e k PAGE NO. EFF. REV.

1-8 1 inter from toe's $70. 571, 575. 576. 577 or $40 h

Close Steen Isolation Velves 1P 1P 1P ,

if R If All Ro.s inserted Are.o.:

.e,oe hot .Ife oste RPV Water Level Can't mined. C.mePV water.Leve.l octemine l Caa ence Injection feminate Injection Inject until:

When RPV Pressure e Minis

  • 4 SRV's Coen Alternate Flooding Pressure. RPV Pressure het Commence injection one main- Decreasing tain RPV Pressure s Minimum RPV Pressure  !

Alternate Flooding Pressure > 50 psig h

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u If RPV Water Level Can't .e Detemined:

Fill Reference Columns

,n,e.t nti, , eve, Instrumentation Avalloble t

Toroinate Injection when RPV Filled a u Redwce Level t

If Level Indication het Re.

stored. Return to 3.3 5 1P 1P When Suppression Chancer Pressure i

< Primary Contaireent Pressure .

I Lielt, inter E0P $70 'RPV Level Cont el" and E0P $71 *RPV Pressure Contro1=

References:

1) EmergencyProcedureGuideline*,MiliatoneUnitOne t
2) Emergency Pro:edure Guideline $, Appendix 8
3) Emergency Procedure GuiJelines, Appenc"x C
4) ACP-QA-3,02, Attachment A

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E0P 578 RPV Flooding

RPV Flooding E0P 578 Page 2 Rev. 1

y 1. PURPOSE 1' - The purpose of this procedure is to flood the RPV using all available injection subsystems.

2. ENTRY CONDITIONS ,

2.1 Enter this procedure from the following conditions and procedura :

2.1 1 E0P 570 "RPV Level Control" 2.1.2 E0P 571 "RPV Pressure Control" 2.1.3 E0P 575 "RPV Level /Rx Power" 2.?.4 E0P 576 "RPV Level Restoration" 2.1. 5 E0? 577 "RPV Depressurization" l 2.1.6 E0P 580 ' Containment Control"

3. OPERATOR ACTIONS

_ 3.1 Place the cor. trol switcties for all 4 APR valves in the "0 PEN" position.

3. 2 IF any APR valve cannot be opened, EEN GO TO E0P 577 "Emergency RPV Depressurization".

3.3 WHEN at least 4 SRVs are open OR Condensate /Feedwater is availabTe for injection, THEN close the following valves to prevent water hamer, 3.3.1 MSIVs 1-MS-1A 1-MS-2A 1-MS-18 1-MS-2B 1-MS-1C 1-MS-2C 1-MS-10 1-MS-2D 3.3.2 Main Stean Line Drain Valves 1-MS-5 1-MS-6 3.3.3 IC Isolation Valves 1-IC-1 1-IC-3 1-IC-2 1-IC-4 E0P 578 RPV Flocding

. . . ._= . _ - . -. . - -.. .. . . . - .- - ..

ftPV Flooding E0P 578 Pag) 2a *

. Rev. 1

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A. APV Level Centrol (t0P $70) i

1. RPV wetde level connet be determined.

O. Containment Centrol (t0? 500)

I 1. Drywell temperatu's reaches the RPV leturetten Toeperature. ,

2. $wPressten Cheneer pressure connet be metateined betow the i Primary Containment Desigi Pressure.

i j C. RPV Level testuration (10P $76)

1. RPY water level connet be determined.

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O. RPV Level /h Power (IOP $75)  !

i 1. RPV water level cannot be detereined, and h Power connet be determined er seln'*eined ebeve M.

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i E0P 578 RPV Floodinq i

RPV Flooding E0P 578 Page 3 Rev. 1 Perform operator actions pertaining to Emergency RPV Flooding in s accordance with the conditions and steps listed below:

Emergency RPV Flooding when any control rod is not inserted beyond position 04. - - - Step 3.4 l NOTE Step 3.4 must be followed whenever all control rods are not inserted beyond position 04 and RPV flooding is required but boron injection has not been commenced. If boron injection is necessary, E0P-578 is entered only if reactor power indication is lost or cannot be maintained > 8%. Instructions in Step 3.4 l will insure th9 vessel is flooded i : controlled manner l

witht.ut power excursions.

Emergency RPV Flooding when P.PV water level cannot be determined. - - - Step 3.5 NOT5 Step 3.5 is entered when RPV water level cannot be determined.

Therefore level response must be inferred from RPV pressure.

Three conditions therefore must be satisfied to verify RPV

- Flooding without level indication:

RPV pressure must be y,50 psig above suppression chamber

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pressure to ensure decay heat is removed.

2. RPV pressure must not be decreasing. A decreasing pressure would indicate a net inventory loss.
3. At least 4 SRVs should be open. A greater number is permissible, but fewer would require a higher RPV pressure to generate equivalent SRV flow.

Emergency RPV Flooding when RPV water level can be determined. - - - Step 3.6 E0P '.,78 RPV Flooding

RPV Flooding E0P 578 Page 4

, Rev. 1

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3.4 E any control rod is not inserted beyond position 04:

3.4.1 .stminate and Prevent all injection into the RPV except from boron injection systems and CRD.

IF while executing the following steps, RPV water ,

Tevel can be determined and RPV Flooding is not required.

THEN enter E0P 575 "RPV Level /Rx Power" and E0P 571 "U V Pressure Control" Step 3.4 and execute concurrently.

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA CAUTION A rapid increase in injection into the RPV may induce 1 large power excursion anti result in substantial core damage.

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA1AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

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3.4.2 WHEN RPV pressure is below the Minimum Alternate RPV g TTooding Pressure, t'

THEN commence and slowly increase injection into the

~

ItFV with the following systems to maintain RPV pressure above the Minimum Alternate RPV Flooding Pressure:

Minimum Alternate RPV Number of open SRV's Flooding Pressure (psig) 6 95 5 118 4 150 3 205 2 320 1 640 3.4.2.1 Condensate /Feedwater 3.4.2.2 CR0 3.4.2.3 LPCI E0P 578 RPV Flooding

RPV Flooding E0P 578 Page 5 Rev. 1 3.4.2.4 CR0 PL p Test Line (OP 302)

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAtAAAAA CAUTION May require opening 1-HS-1A, IB, 4 manually.

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 3.4.2.5 CR0 Head Spray (OP 302)

NOTE Systems injecting outside the shroud are preferred because they minimize the cold water reactivity addition in a core with an uncertain shutdown margin.

3.4.3 IF RPV pressure cannot be maintained above the RTnimum Alternate RPV Flooding Pressure THEN commence and slowly increase injection into the RP'! with the following systems to maintain RPV pressure above the Minimum Alternate RPV Flooding Pressure:

3.4.3.1 Core Spray 3.4.3.2 Fire System (OP 332A) 3.4.3.3 ECCS Keep-full Systems 3.4.3.4 ESW (X-Tie) to ECCS (OP 335) 3.4.4 WHEN all control rods are inserted beyond position 04, OR The reactor is shutdow.. ind no boron has been injected into the RPV (reactivity addition is no longer of concern),

THEN continue in this procedure.

3. . 5 IF RPV water level cannet be determined.

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3.4.5.1 Fill all RPV level instrumentation reference columns.

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O E0P 578 RPV Flooding

RPV Flooding E0P 578 Pag) 6 Rev. 1 O 3.4.5.2 Continue injecting water into the RPV (V until temperature near the cold reference leg instrument vertical runs (CRP 925 TR 1602-5) , 'l i

is below 212'F and RPV water level instrumentation is available (CRP 925 TR 1602-5)

E whilt executing the following steps, RPV water level can be determined, continue in this procedure at step 3.7.

3.4.5.3 IF it can be determined that the RPV is Ti11e'd by direct confirmation, OR E RPV pressure is at least 50 psig above suppression chamber pressure (indicating l the RPV is filled), 7 THEN terminate all injection into the RPV and reduce RPV water level to obtain on-scale level indication 3.4.5.4 IF RPV water level ir,dication is not .

Estored within the Maximum Core Uncovery

' Time Limit after commer.cing termination of injection into the RPV (see Figure 11) e THEN GO T0 step 3.5.

n b 3.5 E RPV water leve'. cannot be determined:

3.5.1 Commence and raise injection flow into the RPV with the following systems until at least 4 SRVs are open, I and, RPV pressure is not lowering and is at le.'st 50 psig above suppression chamber pressure:

3.5.1.1 Condensate /Feedwater i 3.5.1.2 Core Spray 3.5.1.3 LPCI l 1

3.5.1.4 CRD .

3.5.1.5 SLC Test Tank (OP 304) 3.5.1.6 SLC/MU Water (OP 304) 1 3.5.1.7 SLC Boron Tank (OP 304) r 3.5.1.8 Fire System (OP 332A) 3.5.1.9 ESV (X-Tie) to ECCS (OP 335) 3.5.1.10 ECCS Keep Full E0P 578 RPV Flooding L

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RPV Flootting E0P 578 Page sa (

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V RPV Flo: ding E0P 578 Page 7 ,

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3.5.2 Maintain RPV pressure at least 50 psig above O suppression chamber by throttling injection to control the rate of i'looding.

3.5.3 JJFRPVwaterlevelcannotbedetermined

3.5.3.1 Fill all RPV level instrumentation L reference columns. -

3.5.3.2 Continue injecting water into the RPV until temperature near the cold reference leg instrument vertical runs (CRP 925 TR 1602-5) <

is below 212*F and RPV water level instrumentation [

is available (CRP 925 TR 1602-5) l lE while executing the fo11cwing steps, RPV water level can be determined, continue in this procedure at step 3.7.  !

3.5.3.3 IF it can be determined that the RPV is Tilled by direct confirmation OR }

g RPV pressure is at least 50 psig above suppression chamber p'. essure (indicating the RPV is filled),

THEN terminate all injection into the RPV i and reduce RPV water level to obtain h),

\m on-scale level indication 3.5.3.4 IF RPV water level indication is not <

E stored within the Maximum Core Uncovery i Time Limit after commencing termination of injection into the RPV (see Figure 11)

THEN GO T0 step 3.5 j I

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RPV Flooding E0P 578 Page 7a

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RPV Flor, ding IOP578 Page 8 Rev. 1 3.6 JJ, RPV Water Level can be determined:

3.6.1 Comunence and raise injection flow into the RPV with the following systems until RPV water level is increasing:

3. 6.L 1 Condensate /Feedwater 3.6.1.2 Core Spray 3.6.1.3 LPCI.,

3.6.1.4 CRD t J

3.6.1.5 SLC Test Tank (OP 304)

, 3.6.1.6 SLC/Mll Water (OP 304)

?,.6.1.7 SLC Doron Tank (OP 304) 3.6.1.8 ECCS Keep Full Systees 3.6.1.9 Fire System (OP 332A) l j

_ 3.6.1.10 ESW (X-Tie) to ECCS (OP 335) 17 WEN suppression chamber pressure can be maintained below the NTiiary Containment Pressure Limit (Figure 7) l j MNenterandexecutethesteps 3.7.1 & 3.7.2 concurrently.

3.7.1 E0P 570 "RFV Level Control"

. 3.7.2 EUP 571 'RPV Pressure Control " Step 3.4 WM:j1c l

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FINAL E0P 578 RPV Flooding O

RPV Finoding E0P 578 Page 8a

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