ML20237L216

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Proposed Tech Specs,Establishing New Testing Requirements for Containment Spray Pumps to Demonstrate Pump Operability. Dne Calculations Encl
ML20237L216
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 08/14/1987
From:
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20237L201 List:
References
TAC-R00205, TAC-R00206, TAC-R205, TAC-R206, NUDOCS 8708200124
Download: ML20237L216 (33)
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l ENCLOSURE 1 i PROPOSED TECHNICAL SPECIFICATION CHANGE l-SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 j (TVA-SQN-TS-87-36) a '4 LIST OF AFFECTED PACES 1 i Unit 1 1 3/4 6-16 l Unit 2 3/4 6-16 i l I i l j L-J j e !I - 8708200124 870814 PDR ADDCK 05000327 P PDR

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F* CONTAINMENT SYSTEMS 'l l 3/4.6.2 OEPRESSURIZATION AND COOLING SYSTEMS CONTAINMENT SPRAY SYSTEM i LIMITING CONDITION FOR OPERATION 3.6.2.1 Two independent containment spray systems shall be OPERABLE with each spray system capable of taking suction from the RWST and transferring suction to the containment sump. e APPLICABILITY: MODES 1, 2, 3 and 4. I ) ACTIOR: e l With one containment spray system inoperable, restore the inoperable spray system to OPERABLE status within 72 hours or be in HOT STANDBY within the next 6 hours; restore the inoperable spray system to OPERABLE status within the a next 48 hours or be in COLD SHUT 00WN within the next 30 hours. SURVEILLANCE REQUIREMENTS n 4.6.2.1 Each containment spray system shall be demonstrated OPERABLE: l a. At least once per 31 days by verifying that each valve (manual, power operated or automatic) in the flow path that is not locked, sealed, or otherwise secured in position, is in its correct position. b. By verifying, that on recirculation flow, each pump develops a S b b\\ 'd!;chrge pressure of greater than or equal top"O p:f g when tested pursuant to Specification 4.0.5. 197 poM at M50 3p j l 4 c. At least once per 18 months during shutdown, by: 1. Verifying that each automatic valve in the flow path actuates to its correct position on a Containment Pressure--High-High 4 test signal. i! 2. Verifying that each spray pump starts automatically on a j Containment Pressure--High-High test signal. J t <j' d. At least once per 5 years by performing an air or smoke flow test d through each spray header and verifying each spray nozzle is ) 4 unobstructed. s 1 il R1 l r 1 -MAfl 251002 i SEQUOYAH - UNIT 1 3/4 6-16 . u.en. i it. 12 i J

j CONTAINMENT SYSTEMS 'j 3/4.6.2 DEPRESSURIZATION AND COOLING SYSTEMS CONTAINMENT' SPRAY SYSTEM ~ \\ LIMITING CONDITION FOR OPERATION 3.6.2.1 Two independent containment spray systems shall be OPERABLE with each spray system capable of taking suction from the RWST and transferring suction I to the containment sump. 1 APPLICA8ILITY: MODES l', 2, 3 and 4 ACTION: With one containment spray system inoperable, restore the inoperable spray system to OPERABLE status within 72 hours or be in at least HOT STANOBY within the next 6 hours; restore the inoperable spray system to OPERABLE status within the next.48 hours or be in COLD SHUT 00WN within the following 30 hours. SURVEILLANCE REQUIREMENTS I 4.6.2.1 Each containment spray system shall be demonstrated OPERABLE: At least once per 31 days by verifying that each valve (manual, .a. power operated or automatic) in the flow path that is not locked sealed, or otherwise secured in position, is in its correct positon. a b By verifying, that on recirculation flow, each pumo develops a d:henb\\ 9 Wp pressure of greater than or equal toy S p+4<f when tested M pursuant to Specification 4.0.5. 151psM af 47so gp/rt c. At least once per 18 months during shutdown, by: 1. Verifying that each automatic valve in the flow path actuates to its correct position on a Containment Pressure High-High test signal. S-2. Verifying that each spray pump starts automatically on a Containment Pressure High-High test signal. i ,a At least once per 5 years by performing 'an air or smoke flow test d. through each spr3y nescer and verifying each spr3y noIZie is A ) unobstructed. SEQUOYAH - UNIT 2 3/4 6-16 -~ s\\ \\ -l

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r A 'k %,, b .t.g. ..) ,.x i > q. .1-3, > s, s ^ 1 + ,y t 'l gs '\\ \\ (j' \\ t \\ < g \\, 1 ENCLOSURE 2 k I t 't ,\\ -!PdOPOSED TECHNICAL SPECIFICATI0JeCHANGE si / '( ) (t \\- \\' '^ 13EQUOYAH NUCLEAR PLALT UNIT 3 l'6T4D 2 3 Q lt 'i s-D00KET NOS 50-327 kAC 50-?,28 I ii (TVA-SQN-TS-87-36) q DESCRIPTION AND J7.'STIFICATION FOR NEW TESTINGREQUIREMEi{rsFqRCONTAINMENT SPRA's PUN'3 s \\ )i N i i g I \\ e 4> r, 4 j \\ s. I g L 1 5 L', ' k ) i.N*s i-i lg: '{, {- \\ I ! t l. t 's i t ( ',N ' i 4 i ,N 1 s s st { n sl 3 I ') i } I g 's t 1 i L g I I ) i i \\', / 4 x .\\

L-L \\ t% 4 c ENCLOSURE 2 s s v y '. g. ( l Description of Change l 3 P The propdsed change will revise surveillance requirement (SR) 4.6.2.1.b to require.a differential pressure of greater than or equal to 157 psid at a L flow rate of 4,750 gal / min to demonstrate pump operability. Reason for Chen g. c ? Efforts were rade to resolve the findings from the " Technical-Specification and Surveillance Review Program." Calculations were not l ..W. found that support the current 140-psig containment spray pump discharge t Q' ' O value in the technical specifications. New engineering calculations were l ) performed to. determine.the minimum pump head required in order to ensure n 1the capability of delivering the required flow rate. A copy of the

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, calculation is' included as attachment 1. The proposed change establishes Q~ En s: testing acceptaneo criteria to prove pump operability based on the a engineering calculations..The accept &nce criteria will be expressed as differential pressure rather than discharge pressure to eliminate l confusion over how variations in the refueling water storage tank (RWST) ~j ih. level are accounted for during testing. l l 7,[ Justification for Change j i The containment spray system is a engineered safety features system that " ), functions to reduce the' containment pressure and airborne fission products in the containment atmosphere following a steam line break or loss of l coolant accident (LOCA).. Pressure reduction is accomplished by spraying cool, borated water from the RWST (during injection) or the containment sump (during recirculation) into the containment atmosphere. System startup is completely automatic upon a high-high containment pressure signal. The containment spray system flow is provided by two centrifugal-type a pumps driven by electric motors. Each pump is rated for 4,750 gal / min i' flow at a design head of 370 feet. The design basis accident results in a required containment spray flow rate of 4 750 gal / min. The engineering i calculations were performed to determine the minimum total developed head required to deliver 4,750 gal / min to the spray nozzles. The total required pump head is determined by calculating the total system losses because ofJfriction, the static head differences, and the o 3 [ p* difforence between containment and RWST pressure. The 9-psig value used ( for cNtainment pressure is taken from figure 6.2.1-20 of the Final Safety 4 Analysis Report (FSAR). This pressure represents the maximum containment n[:t .p m sure during the injection phase. FSAR Section 6.2.1, " Containment Functional Design" (LOCA analysis), indicates that the injection phase I j pressure is a valid peak pressure because switchover to the containment sump occurs well before ice bed meltout. The minimum water level in the REST is used for the elevat. ion in calculating the static head. The total losses calculated in the containment spray system at a flow of 4,750 i gal / min are 362.3 feet of water for the worst case. This corresponds to a l

N 1* I l 2 I$ differential pressure of 157 psid. The proposed change wi11' require the pumps l to develop a differential pressure of greater than or equal to 157 psid at ~ 4,750 gal / min when testing on recirculation flow.. This acceptance j criteria will demonstrate reliable pump performance to ensure proper accident mitigation, i Teet instrumentation errors are not considered in this value. The instrumentation errors will be included in the test instruction. This I approach is necessary to' allow for variations in test equipment that may have different accuracy characteristics. The acceptance criteria. are specified in differential pressure rather than discharge pressure to eliminate confusion on how to account for variations in 'the RWST level. The use of a differential pressure value based on the l limiting injection requirements makes the test acceptance criteria independent r of test conditions. This approach eliminates the potential for error or s misinterpretation, i 7 I Note that attachment 1_(sheet 23 of 24) indicates that the containment spray flow restrictors were resized as a result of preoperational test l deficiencies. This statement is inconsistent because the test deficiency stated that the pump flow fell below the manufacturer's curve. Although no documentation can be found to justify the installed orifices TVA believes that the original calculations were based on using the recirculation mode from the containment sump. This would indicate a lower pump head because the pressure inside containment would not be a factor; both the suction and the discharge pressure are inside containment. l Preliminary data has been taken that indicate the pump's ability to meet the new head requirement. Pump 2A-A developed 378 feet of head (163.7 psid) at 4,750 gal / min and pump 2B-B developed 380 feet of head (164.6 psid) at 4,750 gal / min. Both values are greater than the value required by the calculations. A'special test will be performed before changing modes to develop the new pump curves. This special test will satisfy the preoperational test deficiency concern identiflod in attachment 1 (sheet 17 of 24). 1 i l t I

AHacked I s c ... ~ ~ ~ --.7.L. ::.:-'-~ z- = --; ; y.. ' (TVA 1C397 (DRE 646) DNE CALCULATIONS- ~ --J__-.P. Pt.AN T/ UNIT TITLE. ' 'r- ~ - CONTAINMENT SPRAY PUMP TEST REQUIRDIENTS-SQN/2 - PREPARING ORGANIZATION KEY NOUNS (Consult RIMS DESCRIPTORS LIST) DNE-MEB-SQEP-M4 CNTMT SPRAY SYS, PIPING, PREOP TESTS, TESTS, DIFF PRESSURE BR ANCH/ PROJECT IDENTIFIERS Each time these calculations are issued, preparers must ensure that the original (RO) RIMS accession number is filled in. SQN-72-D053 Rev (for RIMS'use) RIMS accession number EPM-DLB-050487 B25 '87 05 21 113 a APPLICABLE DESIGN DOCUMENT (S) R See " Sources of Information" R_ SAR SECTION(S) UNIO SYSTEM (S) R_ 6.2.2.2 NA Revision 0 R1 R2 R3 Safety related ? Yes @ No O ECN No, (or indicate Not Applicable) Statement of Problem b7112 ared Determine the mini $tum head required M to be developed by the containment 5%

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) spray pumps in order to verify the p/D Chgeeg { pumps' capability of delivering f6/a Rpiewe ' 4750 gpm to the spray nozzles at W b/~N a pressure of 40 psi. V hAD d / Date 6' ~Z l-8 7 List all pages added g*1i by this revision, l f List all pages deleted by this revision. }g ;! l List all pages changed by this revision. Abstract This calculation supersedes DNE Calculations These calculations contain an unverified assumption (s) EPM-GWB-031487 (B25 870407 136) and EPM-DLB-that must be verified later. Yes O No 0 041587 (B25 870423 100). R0 This is an essential calculation. These calculations were made to determine test requirements for the unit 2 containment spray pumps in order to verify the capability I of supplying the required flow to the spray nozzles. The pump discharge orifices in the lines to the spray ring headers were also resized. These calculations respond to Baseline and Verification Program Action Item 8081 and the memorandum from L. M. Nobles to D. W. Wilson dated February 2,1987 (S53 870202 800) requesting verification of the. 140 psig lower limit at the pump discharge as shown in. Technical Specification 4.6.2.1.b. These calculations determine the following: Pumps 2A-A and 2B-B must develop heads of 362.3' of water 0 4750 gpm. We recommend that a comprehensive Pre-Op Test be performed to establish a set of e performance points for the pumps (Sue CONCLUSION). The Technical Specifications must be revised to include a statement of flow and preferably a requirement for total head of the pump rather than a disch. press. The orifice plates for the pump discharges to the spray ring headers for both pumps must be resized to the I.D. of the pipe (12.00") af ter the determination of adequate NPSHA. O u.eroiam ano sio,e caicuiae.ons in nivS Se,v,ce center. u croism ano oesirov. O 5-132 SB-K O u.crorarn ann.... urn caicuui,ons io: J. L. Purkey Acoress. \\ J s.

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Deficiency No. .- '395~~~1-1J ~ SEQUOYAH NUG-EAR PLANT-- ' s D ss5d' D -G--@ M ~ To: L. W. Lau, wec174 C.K -fc From: S te++ LOM P Prod Test Director C ~ v' h ( h J a J J

Subject:

PREOPERATIONAL TEST DEFICIENCY REPORT I pnpy uVi L The Test Deficiency described below was encountered during conduct of the following preopera- -ions! test: Test No. TM ' A \\ Unit (s) 1 Tes; Title CNUNY' Soe % So ah 4 d Deficiency Description % e. nuun d,A m 44 k% % Cw4 a t s.t. i r 3 o r o.u QLmn

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[ 6-IT40 -i est Def.. Date Attac. ment (s): T Yes O No m ? Prod Test Direc;or 7.A ht, W N ~-. P Prod Test ?rogram Cg::inator %

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ccur .m svw vm rexr aecwmcurs s a.e_ c.2&_ ,9 ~ 'i comaitt> us zm + * -m s a a n.. % c ~ ~ SEQUOYAH NUCL Deficiency No. N--Q- >l ? ' cm.za-oso}en Mccrcn LW m PM9 p g I j Date issued /O-6-80 ~ To: L. W. Lau, WSC174 C K - i From: 9eM l Oht P Prod Test Director 3 l F q r

Subject:

PREOPERATIONALTEST DEFICIENCY REPORT J .J Li O ),y The Test Deficiency described below was encountered during conduct of the diodng probpera. I tional test: j ~ j Test No. Dk* @I6 Unit (s) 1 Test Title C m+c N mc>n4 S o r om .h d < m k n 4a a +c ka.+ hf c M m e~+- l i Deficiency Description The Au. m i S o co O ron '1 6 - W d o r ?w., hu li Clow en pr.e.+1 m u ('S h\\e, S. wh .C& \\+ A h' m e & b e e Ne.,:,e,- e,lleeia s (24.S %4 e Tn ),4 O re _. w 3 L.O sosi "G le 4 Pr cu ue .2&. 0 rasi O h c h o,.o e Pres p

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&q_,t.,_ bes4 rne,4 et ew 4 U ~ t (R.cGee,na. O N -. I to e4 Tes4-D W'Nk m e.\\ ~ 1 e s O cru 1 Rroas ,EN DES Test Representative, was verbally g w informed of this Test Deficiency on l 0 ~~ 3 ~ N at 3210 a.m. l (Date) (Time) h l Potential repor:able occurrence issued: Ye5 Pro No. QNo (If Available) This Test Deficiency F_-~t is restraining further testing. gis Not Test Deficiency resolution requested by Date J-Attachment (s): {Yes 2 No / L WAC P'Frod Test Direc*g W PM, W& P Prod Test Pregram Coorpor - -.,, s,... n ~:~=' .. - ~.,

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i . ----- y ' DIVISION OF HUCLEAR ENGINEERING (DNE) SECUCLN WIII & 77-or Z ' ; - * /' H-SEQUOYAN ENGINEERING PROJECT (SQEP) " ~ ~ ~ ^ ~ ~r, SEglisTAE 7.Ngrtnswrig pgitCEZEEE ---- l ~ - (a.b e - PROJ ECT - MANUAL ;.3 ~ c_ S4545; REVIS' ICE'3' .p .\\ m-..---.. .. ~,. $ed-7E-To$'1 - CAM 9wfED 22GCBkrE s-4-r7 _- .] ~ ?yh j.COMTAt*AMENTl 1.TEAY. wMT tytT* _REstutR(MF.MTT EPM-st.T. oTo467 Cl4Ec.WCD -LE % ATE D't 4 7 g 1 DESIGN BASELINE AND VERIIICLTIC5 Pacmw i ~_ . ACTION ITEM PUNC1! LIST EFDLTE POEM l -ACTION ITEM 8CEV I i The following information should be updated in the act. ism iteur purchlist ' database as indicated (Enter HA if no change is requiLref):; 1. Corrective Actions:

6. W. Oor.EggAwp hdES) Mau Per-oa.m CA.t coa-coas av Mneea ts. r%27.

~ 2. Restart Categorization: / / Yes / /, Re / M Nd>CRenge 3. Justification for Restart Categorization.: i 4. Status: O 5. P/2 Activity ' number: l ._., _ i" '. ~ T. _ _ _ l.. L.

6. 'ECH numbe*rs:

/ / / f ? 7.. Completion Date: l 8. Date Code: / /S (for scheduled), / / A (1er actuail f _,f No Charge 9. Corrective Action Code (proposed, approced, etc.) H ~ Sinnatures l Responsible Action Party h l' !87 System Engineer (Concurrence).[N t' f #8 E ) i [ Supervisor, (for closed items only): f Distribution: g RIMS, SL 26 C-K (Closed items only) Responsible Actir.e Earty Project Staff (database entry) Invoiced Systen Engineersc: Originator Discipline Evaluation Supervisor SQEP - ONSITE - DE05;$QEP45 5

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's Lead E.ngi.n.ee'r .e. t s.) V Infor=ations & T. Tor =ey l J. F. Cox R. L. Jones J. E. Ovnby J. E. Xaddox J. Simpson ""'~~"~'.'"'~~~~.~".t*. Involved System Engineers i R R CAM pr$dLL. a a.:-. Dw N -h5h Origuinator Discip1' ice Evaluation Supervisor..._..._..._..._......'<db y P.*- a g ...s 8EP - Aug. 26,1986 DEo? ;IR623 a.02 MNMM

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i e 1 1 -) ' t, ) i i ENCLOSURE 3-l r 's l PROPOSED TECHNICAL SPECIFICATION CHANCES SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2,, l DOCKET NOS. 50-327 AND 50-328

  • .)'

a h. (TVA-SQN-TS-87-36) } ,,e ' qi DETERMINATION OF NO SIGNIFICANT HAZARDS' CONSIDERATIONS,j 7 I l l r 'f I l ,l. 5 I 'l } I I t..

\\' e-as r 0-c ENCLOSURE 3 an, . (.,. ll% l bN' -SIGNIFICANT HAZARDS CONSIDERATIONS' 1. Is the probability of an occurrence or the consequences of an ~ y accident previously evaluated'in the safety analysis report

  1. 1 9 significant1y' increased?

No. The containment spray system is an engineered safety features system that' functions to reduce containment pressure and airborne F I fission products in the containment atmosphere following a loss of < coolant., accident. The accident analysis requires a cont 11nment spray flow rate of 4,750 gal / min to' ensure adequate accident mitigation. The propdsed change establishes new. testing requirements for the containment spray pumps based.on an engineering calculation that determines the required minimum total developed head at a flow rate of 4,750 gal / min. Thus, the new acceptance criteria for the . containment spray pumps will more accurately reflect pump design capability. I 2. Is the: possibility for an accident'of a new or different type than evaluated previously in the safety analysis report created? No. ' The change in testing requirements for the containment spray pumps will ensure proper operation of.this engineered safety features system. No hardware changes or changes in system operation have been made. No new orj ifferen6 types of accidents.have been introduced by this change._ f 3. Is the margin =of safety significantly reduced? l No. The change in testing requirements for the containment spray. pumps is conservative. System operation has not changed. The proposed differential pressure value and corresponding flow rate will more accurately test system operation therefore increasing the margin of safety. l ) i ij 'I ' l t .+. L_g. h[. e}}

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