ML20137M723

Rev 0 to JPN-PSL-SENP-95-105, St Lucie Plant Design Review Safety Related Relief Valves

ML20137M723
Person / Time
Site:	Saint Lucie
Issue date:	08/30/1995
From:	FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML20137K821	List: ML20137K816 ML20137K910 ML20137K940 ML20137K961 ML20137K972 ML20137K998 ML20137L016 ML20137L023 ML20137L046 ML20137L065 ML20137L077 ML20137L081 ML20137L092 ML20137L116 ML20137L130 ML20137L141 ML20137L162 ML20137L191 ML20137L205 ML20137L226 ML20137L346 ML20137L359 ML20137L389 ML20137L786 ML20137M723 ML20137M926 ML20137N194 ML20137N205 ML20137N211 ML20137N220 ML20137N238 ML20137N343 ML20137N366 ML20137N431 ML20137N791
References
FOIA-96-485 JPN-PSL-SENP-95, NUDOCS 9704080164
Download: ML20137M723 (40)

Text

. . __ _ _ _ . . _ --.

1 JPN-PSL-SENP-95-105 Rev.0

, 8/95 Page1of16 I

l REVIEW AND APPROVAL RECORD 1

1 PLANT ST. LUCIE UNIT 1AND2 I

- TITLE: ST. LUCIE PLANT DESIGN REVIEW SAFETY RELATED

RELIEF VALVES l 4,

4 LEAD DISCIPLINE: MECIIANICAL l i

j ENGINEERING ORGANIZATION: PRODUCTION ENGINEERING GROUP l

l l

REVIEW / APPROVAL:

D(TERFACE TYPE l GROUP PREPARED YERH1ED APPROVED FPL APPROVED

• ENPUT REVIEW N/A Y -

J ELECT  !' [ [ .

IAC X .

CTVIL X .

WC X .

E5! X -

NUC FUEL X .

2

• For Contractor Evals As Detennined By Projects ** Review Interface As A Min On All 10CHL50.59 Evals and PLAs FPL PROJECTS APPROVAL: '

v

' DATE:Ph* f l

OTIIER INTERFACES Form 24, Rev 6/94 9704000164 970402 PDR FOIA BINDER 96-485 PDR i

I l 0 JPN-PSL-SENP-95-105 Rev.0

. Page 2 of 16 l

LIST OF EFFECTIVE PAGES PAGE No. REV No. DESCRIPTION l 1 0 Cover Sheet l 2 0 List of Effective Pages

. 3 0 Table of Contents I 4-16 0 Relief Valve Design Review l ATTACHMENTS 7.1, p.1-10 0 Unit 1 Relief Valve Summary Sheets 7.2, p.1-10 0 Unit 2 Relief Valve Summary Sheets 7.3, p.1-5 0 Action Plan Matrix l

l l

I

! \

I 1

l l

3 JPN-PSL-SENP-95-105 Rev.0 Page 3 of 16 TABLE OF CONTENTS SUBJECT PAGE NO.

EVALUATION COVERSHEET 1 LIST OF EFFECTIVE PAGES 2 TABLE OF CONTENTS 3

1.0 BACKGROUND

AND INTRODUCTION 4 2.0 METHODOLOGY 5 3.0 RESULTS 6 4.0 ACTION PLAN 16 5.0 FOLLOW-ON ACTIVITIES 16

6.0 REFERENCES

16 7.0 ATTACHMENTS 16 l

l

{, JPN-PSL-SENP-95-105

Rev.O Page 4 of 16

1.0 BACKGROUND

AND INTRODUCTION 1

g Problems of significance to operations have been experienced with Unit I relief valves V3439 (Unit 1 Low 2 Pressure Safety Injection discharge header) and V2345 (Unit 1 Letdown header between the Letdown l Control Valves and the Pressure Control Valves).

i '

" In the case of V3439, in August,1995 the valve opened after alignment and initiation of shutdown cooling.

. ., This valve relieved due to a " normal" LPSI pump start pressure spike of approximately 30 psi over normal 1

operating pressure and did not rescat until the LPSI pump was secured. Review of the design parameters for j - the relief valve revealed that nominal setpoint for the valve inadequately considered normal operating I conditions. Further, the blowdown setting would not allow the valve to rescat once the system pressure i retumed to normal pump curve performance. Note that this issue was the subject of LER 95-006.

In the case of V2345, there has been a long standing problem with the relief valve lifting during system transients such as switching from the P to Q Letdown Control Valves. The relief valve has lifted in response to system transients and has at times not rescated without securing letdown or reducing letdown operating pressure. Review of design information reveals that the blowdown setting for the valve will not allow it to rescat even after system pressure is restored to normal values following transients.

As a result of the above issues and informal reviews of other relief valves, a comprehensive review of the St. Lucie Unit I and Unit 2 Nuclear Safety Related relief valves was conducted. He purpose of the review was to confirm that adequate margins exist for all Nuclear Safety Related relief valves in the areas of the lift setpoints and blowdown settings. He review was performed by a plant team, headed by Engineering, and consisted of members from Maintenance, Operations, Technical Staff and Engineering. The team members were as follows:

1 S.T. Hale - Engineering (Team Leader)

J. Totton - Operations 1 R.J. Young - Technical Staff, System Engineering I R. Dietz - Plant Licensing N. Ireland - Engineering J. LaDuca - Engineering R. Dunlea - Engineering J. Kagan - Mechanical Maintenance R. Custis - Engineering J. Porter - Engineering W. Neff- Engineering This review excluded the Main Steam Safety Valves (MSSVs) and Pressurizer Code Safeties and Power Operated Relief Valves (PORVs). De MSSVs and the Pressurizer Code Safeties are tested under unique procedures and the basis for their design lift and blowdown parameters are well understood and incorporated into plant documents including the FSAR, Design Basis and Maintenance procedures. The PORVs are not true relief valves in that they are not " passive" devices and are pilot actuated by a solenoid valve which uses 1 1

l l

. ._ - . . . .- . _- - - - - - ---- . . ~ - _ . _ - --

JPN-PSL-SENP-95-105 Rev.0 Page 5 of 16 4 .

pressurizer pressure as an input.

1 i 2.0 METHODOLOGY i The review effort employed the following process:

(a) A list of Nuclear Safety Related relief valves was developed using the valve list within

., Passpon/TEDB.

-(b) A worksheet was developed for each valve to evaluate the lift setpoint margin and blowdown margin. As an initial step, the design basis for each valve was established by a detailed review of available reference information including the FSARs, the DBDs, vendor drawings, and Maintenance

and IST Procedures. The basis for the lift setpoint and blowdown were also established. Specific j parameters were then evaluated on the forms as follows: .

-Maximnm system oneratine pressure: The application for each valve was reviewed to determine a bounding value for operating pressure. Consideration was given to such factors as operation of systems in normal and post accident modes, single and multiple pump operation, and manual

} operations. Discussions were held with Operations and in some cases actual plant readings were used in establishing the maximum system operating pressure. Except where specifically noted on i the worksheets, the established' maximum operating pressure was further increased by 10% to ,

} account for pressure transients from factors such as pump starts.

-Lowest relief valve setnoint pressure: The nominal lift pressure for each valve was determined from a detailed review of available design information. The design value was then reduced by 3%

to account for specified tolerances. Physical factors which could impact setpoint pressure were considered in the value determined. The actual relief valve setpoint pressure was utilized in cases where the design value resulted in limited or negative lift margin.

Ilft setpoint annivsis: The lowest relief valve setpoint pressure was then compared to'the maximum system operating pressure (plus any assumed pressure transients) to establish the margin 4

j- to setpoint lift.

-Blowdown annivsis: The blowdown was calculated by multiplying the specified blowdowa ,

percentage times the design setpoint. This blowdown value was then subtracted from the lowest '

relief valve setpoint to determine the pressure at which the relief valve would be expected to rescat. ,

This calculated pressure was then compared to the highest system operating pressure to determine )

rescat margin. '

- Additional Information: Flow capacity, actual maintenance settings, maintenance history, and I the location of relief valve discharges were determined.

(c) Industry and In-house event information was collected and reviewed for applicability.

3 .

l l

l_

, JPN PSL-SENP-95-105 Rev.O Page 6 of 16 (d) The Safety Related relief valves identified in 2 (a) were reviewed using the above process to establish the margins for lift setpoint and rescating following lift. The inputs collected and reflected on the review sheets and all calculations performed were verified.

The results of the evaluation are provided below.

3.0 RESULTS

'O A total of 53 relief valves were reviewed for Unit I and 61 valves on Unit 2. The results of the lift setpoint

-and rescat pressure analyses are provided in Attachment I for Unit I and Attachment 2 for Unit 2. The documentation for valves with negative but acceptable rescat margin is incorporated on the summary sheets.

These were typically gas or air relief valves on tanks which relieve to protect the tanks from overpressure but reseat well above minimum required pressure for safety functions. Of the valves reviewed,8 valves on Unit I and 5 valves on Unit 2 have negative margins from a lift setpoint and/or blowdown perspective which require further evaluation. ne tables below provide valve lift and rescat values compared to system conditions. ne calculated margins, a brief evaluation and a summary of short and long term recommendations for each of these valves follows the tables:

TABLE 1-UNIT 1

SUMMARY

MAX DESIGN OPER LIFT

~

^ RESEAT DESCRIPTION PRESS PRESS PRESS OPER O. PRESS (psig) +TRANS (psig) (psig)

(psig)

• V2345 Letdown 600 550-600 582 500 432 V2324, Charging Pump 2735 2463 2513 2413 2256 V2325, Discharge V2326 V3412 HPSI Header B 1750 1489 1750 1354 1316 V3417 HPSI Header A 2485 2341 2410 2291 1810 V3468 SDC Suction Line A 320 309 324 279 292 V3483 SDC Suction Line B 320 309 329 279 297

[, JPN-PSL-SENP-95-105 Rev.0 Page 7 of 16 b

I TABLE 2-UNIT 2

SUMMARY

MAX

, y3tyg DESIGN OPER LIFT p RESEAT DESCRIPTION PRESS PRESS PRESS PRESS l (psig) + bb S (psig) (psig) l 2-V2345 Letdown 600 550-600 582- 500 432 ,

2 V3412 HPSI Header B 1585 1398 1600 1271 1204 l 2-V3417 HPSI' Header A 2485 2340 2400 2290 1808 2-V3439 LPSI Header A 500 492 510 436 460 2-V3507 LPSI Header B 500 488 505 436 455 3.1 UNIT 1 3.1.1 Chemical Volume and Control System:

1 3.1.1.1 V2324. V2325. and V2326-Charvine Pumn Discharee Relief Valves Maroin Summary Desian Lift Marcin=+50 nsi - These valves have positive lift margin. This margin considers the transient condition of starting a third charging pump while two pumps are operating. These valves I

are uncompensated, so the margin also takes into account the difference between the design superimposed back pressure of 165 psig and the actual back pressure of 30 psig (Note that these valves relieve from the discharge of the charging pumps back to the suction at a capacity equal to the charging pump flow, so there is no loss ofinventory from the charging system itself). This results in the valve actually liAing 135 psi lower than its design setpoint. Actual operation of three pumps has not lifted these reliefs valves confirming the conclusions of the calculations that the present lift margin is acceptable. For transients such as isolation of the charging discharge header from events such as solenoid valve closure the relief valves will lift by design to protect the piping and the pumps themselves from over pressure (positive displacement pumps).

l Rescat Maroin=157 psi - These valves have negative reseat margin indicating actions would have to be taken in order to rescat the valves under certain scenarios..

i

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

],

JPN-PSL-SENP-95 105 Rsv. O Page 8 of 16 t

Evaluation The specific conditions which could cause these relief valves to lia are (1) isolation of the charging header, and (2) operation of three charging pumps at elevated RCS pressures. In either case, if the

. . relief valves do lift, then the charging pumps would be secured by procedure (rescating the relief -

valves) until the flow path is reopened, or the RCS has returned to lower pressure conditions. Once

- this has occurred, a charging pump can be restarted. Based on the above, lin margin is the critical parameter, and negative rescat margin is not pose a serious concern. His is not an issue from a nuclear safety perspective because the relief valves are performing their design function and charging can be restored. Engineering has issued a package to improve both the lin and rescat margins. -

Immediate Actions (orior to Unit startuo)

.# ' ME 07-195M was issued 8/25/95 to modify the design superimposed back pressure from 165 to

' .;Y l15 p'ig-(suction s line pressure during emergency boration with the Boric Acid Makeup Pumps).

This will add another 50 psi lin margin and rescat pressure margin. This package should be

','* \ ~ implemented during the present outage prior to Unit startup.

Lone Term Actions -

t None 3.1.1.2 V2345-Letdown Relief Valve Marain Summarv ,

Demian Lift Marain=+32 nsi - his valve has positive lift margin by the calculation methodology used in this review. This valve has been known to lift, however, indicating there are significantly larger pressure transients under certain conditions than the 50 psi spike assumed in the analysis. It is thought that the occasional instabilities in the letdown control system contribute to these pressure transients. He valve relief capacity is 165 gpm and relieves to the Holdup Tanks.

Rescat Marain=-68 nsi - This valve has negative rescat margin indicating actions would have to be taken in order to rescat the valve.

Evaluation As noted above, this valve has lifted in the past and actions were underway to improve the situation prior to the design review activity described herein. He condition on V2345 does not pose a nuclear ,

l safety concern because the valve relieves to the Holdup Tanks and can be rescated by either lowering

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

JPN PSL-SENP-95-105 i

Rev.0 i Page 9 of 16 the setting on the pressure control valve downstream of the relief valve, or securing letdown. It does, however, represent an operator workaround which should be corrected.

, immediate Actions (orior to Unit startuo) i PCM 108-195 has been issued to lower the letdown back pressure control set pressure to 430 psig and reduce the blowdown setting on V2345 from 25% to 15%. This modification will improve

. margin to lift and ensure positive rescat margin. This package should be implemented during the

' ~

present outage prior to unit startup.

Long Term Actions The performance of this valve as well as that of the letdown control system should continue to be i monitored to verify acceptable corrective actions. Additionally, the actions implemented to improve 1 the stability of the letdown control system on Unit 2 should be considered for Unit 1.

l i

3.1.2 Safety Inlection System 3.1.2.1 V3412-HPSI 1B Discharne Hiph Pressure Hender Relief Valve Marcin Summarv l

1 Desien Lift Marcin=+194 osi Design. +261 osi Actual - His valve has significant lift margin, even considering the maximum pressure conditions of Contamment Spray /High Pressure Safety Injection (HPSI) Pump " piggy-back" operation. Under this configuration, the Contamment Spray purap is assumed to be at " dead-headed" conditions and the HPSI Pump at normal operating conditions because the HPSI Pump has significantly lower flow. His margin also considers a 135 psi pump start transient. Based on the actual valve setpoint, the valve has an additional 67 psi oflift margin.

This valve has a minimum required capacity of 5 gpm (30 to 50 gpm actual) and relieves to the floor of the safeguards pump room.

Rescat Marcin=-105 osi Desien. -38 psi Actual - His valve has negative rescat pressure margin in a " piggy-back" configuration with the Containment Spray and HPSI Pumps.

Evaluation j A-Considering this valve has significant;M rescat margin, it is extremely unlikely it will lift under the maximum operating pressure conditions. Therefore, the valve will perform its design function and the function ofthe HPSI system is not adversely affected. The negative rescat margin is undesirable, however, and considering the safety significance of the HPSI system, it is recommended the valve be modified to achieve positive rescat margin.

_- . _ . - - . _ - - - - . - - - . . - . - - - ~ - .

JPN-PSL-SENP-95-105 t

Rev.0

! Page 10 of 16 immediate Actions (orior to Unit startun)

r. -

, w EP 115-95 was issued on 8/27/95 to increase the Design Setpoint of V3412 from 1735 psig to 1750 l 7 D psig (the design pressure of the piping) and reduce the blowdown from 25% to 10%. With these changes, this valve will have positive rescat pressure margin. His package should be implemented

, during the present outage prior to Unit startup.

. Long Term Actions None. l

3.1.2.2 V3417-HPSI Pume 1 A Discharce High Pressure Hender Relief Valve Marcin Summary 1

Desien Lin Margin =-12 osi Desien. +69 osi Actual - This valve has negative design lin margin, l but positive actual lin margin. This margin considers the worst case pressure condition which is in D an alternate charging line up (for situations where the normal charging system may not be available) l through the A HPSI header. The valve has significant liR setpoint and reseat pressure margin for all other operating modes including HPSI Post LOCA Recirculation. This valve has 132 gpm of capacity equal to 3 charging pumps. The valve relieves to the holdup tanks

- Reseat Margin =-562 osi Desien. -481 psi Actual-osi - His valve has negative rescat margin indicating actions would have to be taken in order to rescat the valves under certain scenarios.

Evaluation This valve has limited lin setpoint margin and negative rescat pressure margin in an alternate charging line-up for situations where the normal charging system may not be available. The valve has significant liR setpoint and rescat pressure margin for all other operating modes including HPSI Post-LOCA Recirculation. Considering the valve has actual lin margin, the valve will perform its

[

design function and the function of the HPSI system is not adversely affected. An operability evaluation, however, should be performed to address the negative rescat margin.

Immediate Actions (orior to Unit startuo)

,d

• EP 113-195 was issued on 8/26/95 to increase the Design Setpoint of V3417 from 2400 psig to 2485 I

N, h psig (the design pressure of the piping) and reduce the blowdown from 25% to 15%. With these ci I ~ changes, this valve will have improved lin margin, but will still have negative rescat margin (-254 design, -79 actual). STAR l-950996 was written and the operability of V3417 was addressed in the l

disposition to the STAR. This disposition was issued on 8/28/95. Engineering also prepared an 4

I L - - -

I JPN-PSL-SENP-95-105 Rev.0 Page 11 of 16 evaluation of operating procedures as a result of the remaining negative rescat margin on V3417, and this evaluation was included in the STAR disposition.

I Lona Term Actions None l l

3.1.2.3 V3468 r6nd V3483-Shutdown Cooling Sueti 7 Line Relief Valves

. Marnin Summan l Design Lin Margin V3468= +1 psi Design, +15 psi Actual Desien Lift Marcin V3483= +1 esi Desinn. +20 osi Actual i

)

These valves have slightly positive design liR margins, but actual values provi 'e more margin to lift.

These margins also consider a 30 psi transient in addition to Shutdown Cooling System maximum entry pressure on cooldown.

Reseat Margin V3468= -1 psi Design, +13 psi Actual Reseat Marcin V3483= -1 osi Design. +18 osi Actual These valves have negative design rescat margin, but actual values provide positive margin.

Ey.pluation ,

1' nese. valves have posed problems in the past with lining when initiating Shutdown Cooling. The ,

valve lin setpoints were revised to improve the lift margin, but further improvement in both liA and rescat pressure margin is recommended. With the revised setpoints, Shutdown Cooling can be initiated without lifting these relief valves. STAQ50430 vyas assigned to Engineering to make recommendations on improving these margins.

Immediate Actions (orior to Unit startuel None Next Refuelino Outane Implement the recommendations of STAR 950430

JPN-PSL-SENP-95-105 Rev.O Page 12 of 16 3.2 UNIT 2 3.0.1 Chemical Volume and Control System 3.2.1.1 V2345-Letdown Relief Valve Marcin Summarv This valve has positive lift margin by the calculation methodology Desien Lift Marcin=+32 osi used in this review. As is the case on Unit 1, this valve has been known to lift indicating there are significantly largar pressure transients under certain conditions than the 50 psi spike as analysis. It is thought that the occasional instabilities in the letdown control system contribu these pressure transients. The valve relief capacity is 165 gpm and relieves to the Holdu Rescat Marcin=-68 osi - This valve has negative reseat margin indicating actions would need to be taken in order to rescat the valve.

Evaluation As noted above, this valve has lifted in the past and actions were underway to improve the s prior to the design review activity described her:in. He condition on V2345 does not safety concern because the valve can be reseated by either lowering the setting on the pres control valve downstream of the relief valve, or securing letdown. Also, enhancements have bee made to the letdown control system which should aid in reducing the magnitude of the transie The condition does, however, represent an operator work around which should be corrected.

Immediate Actions None.

Next Refueline Outage Ari EP is being prepared for issue on 10/1/95 to implement the Unit i V2345 modifications 2.

Long Term Actions The performance of this valve as well as that of the letdown control system should monitored to verify acceptable corrective actions.

K _-m.e,6rA,4-*,,e4.u,AM& - - *reA444 i ~ ' "- + e 2 n *& -.-

l JPN-PSL SENP-95-105 3

Rev.O Page 13 of 16 l

. 3.2.2 Safety Inlection System 3.2.2.1 V3412-HPSI 2B Discharce Hich Pressure Header Relief Valve l

Marcin Summarv

~

l l .

Desien Lift Marcin=+139 Desien. +202 Actual - This valve has significant lift margin, even  !

considering a 127 psi pump start transient. Unit 2 does not have a Containment Spray /HPSI Pump

, i

- " piggy-back" configuration. Base ~d on the actual valve setpoint, the valve has an additional 63 psi l 4 of lift margin. This valve has a minimum required capacity of 5 gpm (actual capacity is 10 to 30  ;

gpm) and relieves to the floor. l Rescat Marcin=-130 Desien. -67 Actual - This valve has negative rescat pressure margin.

! Therefore, if the valve were to lift, actions would have to be taken under certain scenarios to rescat the valve.

1 j

i Evaluation lk )

! Considering this valve has signific reseat argin, it is extremely unlikely it will lift under the maximum operating pressure conditio . -Therefore, the valve will perform its design function and

the function of the HPSI system is not adversely affected. The negative rescat margin is undesirable, however, and considering the safety significance of the HPSI system,it is recommended the valve be modified to achieve positive rescat margin. Until modifications can be made, an operability evaluation should be prepared.

Immediate Actions Engineering Evaluation JPN-PSIMENP-95-103 was issued 8.G7/95 addressing HPSI system l operability with V3412 at its premat lift and blowdown settings. j l

Next Refueline Outace l An EP will be issued by 10/1/95 which will reduce the blowdown on V3412 from 25% to 10%.

With this change, this valve will have positive rescat pressure margin.

Lone Term Actions None i

i l

i l

l

JPN-PSL-SENP-95-105 1* ' Rev.0

, Page 14 of 16 3.2.2.2 V3417-HPSI Pumn 2A Discharce Hich Pressure Header Relief Valve Marcin Summarv

.9 Desien Lin Marcin=-11 osi Desien. +60 osi Actual - This valve has negative design lift margin, but positive actual lin margin. His margin considers the worst case pressure condition which is an alternate charging line-up (for situations where the normal charging system may not be available) through the A HPSI header. He valve has significant lift setpoint and resent pressure margin for all other operating modes including HPSI Post-LOCA Recirculation. This valve has a capacity of 132 gpm equal to 3 charging pumps and relieves to the Holdup Tanks.

Reseat Marcin=-553 osi Desien. -482 Actual - his valve has negative rescat margin indicating actions would have to be taken in order to rescat the valves under certain scenarios.

Evaluation This valve has limited lin setpoint margin and negative rescat pressure margin in an attemate

- charging line up for situations where the normal charging sys?.em may not be available. He valve has significant lift serpoint and rescat pressure margin for all other operating modes including HPSI Post-LOCA Recirculation. Considering the valve has positive actual lift margin, the valve will perform its design function and have no adverse affect on the HPSI system. If the valve were to lift, however, the charging pumps would have to be secured in order to rescat the valves. Until modifications can be made, an operability evaluation should be prepared.

Immediate Actions Engineering Evaluation JPN-PSL-SENP-95-103 was issued 8/2?/95 addressing HPSI system operability with V3417 at its present lift and blowdown settings. Engineering also prepared an evaluation of operating procedures as a result of the negative reteat margin on V3417. This evaluation was included in the STAR disposition for V3417 on Unit i.

Next Refuelinc Outace

^

3

( An EP Mil be issued by 10/1/95 which will increase the design setpoint of V3417 from 2400 psig N to 2485 psig (design pressure of the piping) and reduce the blowdown from 25% to 10%.

Lone Term Actions None m._

JPN-PSL-SENP-95-105 l, Rev.O i

Page 15 of 16 3.2.2.3 V3439 and V3507-Low Pressure A and B Discharne Relief Valves Marcin Summarv i

Design Lin Margin V3439=-24 Design, +18 Actual Desien Lin Marcin V3507=-24 Desien. +17 Actual i

• I These valves have negative design lin margin, but positive actual lift margin. The design lift margin considers the worst case pressure condition of LPSI Pump dead head conditions and a 30 psi

. pump start transient.

Rescat Margin V3439=-1 Design, +24 Actual' Rescat Margin V3507=-1 Desien. +19 Actual .

These valves have negative rescat margin indicating actions would have to be taken in order to rescat the valves under certain scenarios.

Evaluation Based on the conservative approach on calculating lin margin and actual lift setpoint data, these valves will not lin upon initiation of Shutdown Cooling (worst case condition) so the function of the system is not adversely affected. The negative rescat margin is undesirable, however, and considering the event on Unit I where this same valve lifted and would not rescat, it is recommended ,

that the valves be modified to achieve positive design rescat margin. An operability evaluation l should also be prepared to address the present conditions until modifications can be implemented.

Immediate Actions Engineering Evaluation JPN-PSL-SENP-95-103 was issued 8/27/95 addressing Shutdown Cooling system operability with V3439 and V3507 at their present lia and blowdown settmgs. l l

Next Refueline Outane (nrior to coina on Shutdown Cooline) j AriEP will be issued by 10/1/95 which will increase the design lift setpoint on these valves from 500 l to 535'similar to what was done on Unit 1. With this change, this valve will have positive design l rescat pressure margin.

Lone Term Actions I None

. JPN-PSL-SENP-95-105 Rev 0 Page 16 of 16 4

4.0 ACTION PLAN An action plan matrix for Unit I and Unit 2 summarizing the above actions is provided in Attachment 3.

5.0 FOLLOW-ON ACTIVITIES I i \

A maintenance specification / standard will be developed by 10!!/95 to reflect the current' relief valve j

setpoints and provide guidance on the selection oflift and rescat values on selief valves. Additionally, Operations (Jim Totten) is interviewing operators and will provide a list of problem non-Safety Related relief valves which have had lift problems. Engineering will evaluate these valves following the 4

methodology outlines above and provide recommendations.

4

6.0 REFERENCES

6.1 Safety Relief Valve Review Forms 6.2 Engineering Evaluation JPN-PSL-SENP-95-103 6.3 PCM 107-195M 6.4 PCM 108-195 6.5 PCM il3-195 6.6 PCM ll5-195 7.0 A'ITACHMENTS 7.1 Unit 1 Relief Valve Summary Sheets-10 Pages

{

7.2 Unit 2 Relief Valve Summary Sheets-10 Pages 1

7.3 Action Plan Matrix-5 Pages i

I l

l l

1 1

l

.irN-PSL-SENP-95-105 Rev.0 Page1of10 b

O ,

ATTACHMENT 1 i

l 1

l . .

l ~

r ACilMENT I UNIT 1-CIIEMICAI VC~ JME AND CONTROL SYb FEM # "- ""58'5 l an e,ws Page 2 etle a

DESIGN DESIGN RESEAT

[(@3) . MAX TRANS LIFT LIFT DESIGN y KESEAT PRESS

OPER DESCRIPTION i l',

L' PRESS SETIT SETPT REMARKS NUMBER PRESS PRESS MARGIN (P50 -3% MARGIN (psig) (Fsig) (ps0

• (psig) (psi)

V2115 Volume Control Tank Outlet W 65 N/A 72.75 7.75 6525 0.25 129 N/A 145.5 16.5 130.5 1.5 Pressure regulated manually g V2199 RCP B!eedoff to Quench Tank during starup ,

V2311 Primary Makeup Water to the Volume 75 N/A 145.5 70.5 108 33 l

Control Tank V2315 Charging Pump I A Discharge to 75 50 145.5 20.5 108 33 Equipment Drain Tank _

V2318 Charging Pump IB Discharge to

=

75 50 145.5 20.5 108 33

)

/ Equipment Drain Tank V2321 Charging Pump IC Discharge to ) 75 50 -145.5 20.5 108 33 Equipment Drain Tank V2324 Chargirig Pump 2A,2B, and 2C 2413 50 2513 50 2256 -@ 3 Pump Operation V2325 Discharge-3 pump operation 'i. jj;j l V2326  !. .; j '3 V2345 Letdown Control Valve Station 500 50 582 .: M^' 432

• qfc . ~ Problems have been experienced '

IQ-pl h., y,. with lifting this relief valve due to

,{ -. f. pressure transients. There is an

.[k.O)k b .+ j { .',. r.; .$ effort presently underway to

2. l,!. 3 ' ' ' ' -

resolve this issue.

V2354 Letdown to lloidup Tanks Downstream 65 50 194 79 144 79 of FE-2202 V2446 VCT Inlet Downstream of V2512 75 N/A 194 119 144 69 V2447 VCT Inlet Upstream of V2512 110 50 194 34 144 34 I

[

+

l . .

e LCHMENT I UNIT.1-SAFE" # -5E"'-'5-"5 JNJECTION SYSTEM

• Rea. e, s/95 rare 3 =t te MAX DESIGN RESEAT VALVE TRANS LIFT LIFT I OPER RESEAT PRESS DESCRIPTION PRESS SETPT SETPT REMARKS NUMBER PRESS PRESS MARGIN

. (psi) 23 % MARGIN .

(P888) (Pst8) (Psi) gp,g) g gp,;)

V321i Safety injection Tank I A2 230 N/A 242.5 218 -12/18

') 12.5 While the rescat margin is 26 Actual i Actual negative relative to the maximum operating pressure, the valve will rescat well above the 200 psig pressure required by safety analysis.

V3221 Safety Injection Tank I AI 230 N/A 242.5 12.5 218 -12/18 While the rescat margin is ,

24 Actual 0 Actual negative relative to the maximum  !

operating pressure, the valve will rescat well above the 200 psig  ;

,/ pressure required by safety I

analysis. I V3231 Safety injection Tank IBI 230 N/A 242.5 12.5 218 -12/18 While the rescat margin is

negative relative to the maximum I

operating pressure, the valve will

((g l rescat well above the 200 psig pressure required by safety analysis.

V3241 Safety injection Tank 182 230 N/A 242.5 12.5 218 -12/18 While the rescat margin is 25 Actual 0 Actual negative relative to the maximum k, cperating pressure, the valve will

[ rescat well above the 200 psig pressure required by safety analysis.

V3407 SIT Outlet Drain to RWT 250 50 437 137 - 324 74 V3412 IIPSI Pump IB Discharge Ifigh Pressure 1354 135 1683/1750 194/261 1249/1316 ,

. Design / Actual-Margin to lift IIcader '

during SIis 347 psi. Maximum l pressure based on CS/IIPSI

, " piggy-back" operation.

/ ..CIIMENT I UNIT 1-SAFET

~

cNJECTION SYSTEM *

" " 55 Reo 8.8.95 rare 4 of to MAX DESIGN RESEAT DESCRIPTION PRESS S PT S PT

^

BR PR S REMARKS P S R (psi) -3% MARGIN (P53) 8 (P5i)

E (PSI) gp3;g) gp,;) j V3417 IIPSI Pump I A Discharge liigh Pressure 2291 50 2329/2410 -12/69 1729/1810

-4 . Alt chg line-up/Act IIcader 1354 135 840 7 11 PSI Post-LOCA Recire V3430 Containment Spray licader to IIPSI 432 30 485/510 23/48 435/460 3/28 Design / Actual Pump IB Suction

-~

V3431 Containment Spray lleader to llPSI - 432 30 485/512 23/50 435/462 34788 Design / Actual Pump I A Suction ._

V3439 Low Pressure IIcader (/ 462 30 519 27 476 14 V3466 Safety injection Tank Outlet Drain t'o 230 50 340 60 252 22 VWT V3468 Loop 1B SDC Retum to LPSI Pump 279 30 310 -~27'8~ i -

Design-STAR 950430

- 324 ,

292 .

Actual  ;

V3469 Loop 1B SDC Rerum to Quench Tank 2248 0 2410 162 2161 ~ -87 Operating pressure is relieved during the lift. As a result the  ;

valve will rescat.

V3482 Loop I A SDC Retum to Quench Tank 2248 0 2410 162 2161 -87 Operating pressure is relieved during the lift. As a result the valve will rescat. .

V3483 Loop I A SDC Retum to LPSI Pu A 279 30 278 Design-STAR 950430 E

. . t sCHMENT I UNIT 1-COMPONEN e

~

• '5 " 5 JOOLING WATER SYS1_M Ora. 8. S/95 rs-e S er 8  !

DESIGN DESIGN MAX DESIGN RESEAT "

VALVE TRANS LIFT LIFT OPER RESEAT PRESS NUMRER PRESS PRESS MARGIN

^

. (psi) -3 % MARGIN .

(P588) (P5'E) (PSI) gp yg) gp,;)  ;

SR-14-7A Shutdown Cooling Heat Exchanger l A, 122 12.2 145.5 11.3 130.95 9 CCW Inlet SR-14-78 Shutdown Cooling Heat Exchanger IB, 120 12 145.5 13.5 130.95 11 CCW Inlet i SR-14-8 A Containment Fan Cooler HVS-1 A CCW 122 12.2 145.5 11.3 ~ 130.95 9 ,

Outlet SR-14-8B Containment Fan Cooler HVS-lB CCW 122 12.2 145.5 I I .3 130.95 9 Outlet SR-14-8C Containment Fan Cooler HVS-IC CCW I20 12 145.5 13.5 130.95 II 1 t

Outlet

~

SR-14-8D Containment Fan Cooler HVS-ID CCW 120 12 145.5 13.5 130.95 Ii f Outlet t

i I

. T A .CIIMENT I ~

UNIT I-CONTA' .IENT SPRAY SYSTEM -

to. m Pap 6ette DEhed' N DESIGN MAX DESIGN RESEAT g

VALVE OPER NUMBER ' RESEAT PRESS

^

PRESS PRESS MARGIN (psi) -3 % MARGIN (PSI)E (Psig) (psi)

(psig) (psi)

SR-071 A LPSI and HPSI Pump I A Suction 27.2 2.7 58 28.1 52 24.8 SR-07-1B LPSI and ilPSI Pump f B Suction 27.2 2.7 58 28.1 52 24.8 SR-07-2 Sodium Hydroxide Storage Tank 5 0.5 7.8 2.3 2.8 -2.2 While rescat pressure is less than maximum operating pressue, this valve being open will not impact the ability of the NaOli tank to perfonn its function.

i i

f

[

l i

i I

e T h

/ .tCifMENT I ~

UNIT l-EMERGEP / DIESEL GENERATORS, -

1. " N 5 i nn. e, em Page 7 ef It DESIGN DESIGN MAX DESIGN RESEAT VALVE TRANS LIFT LIFT l OPER RESEAT PRESS DESCRIPTION PRESS SETPT SETPT REMARKS l

NUMBER PRESS PRESS MARGIN i

(psi) -3% MARGIN (psi) 8 gp,gg ) (p,;)

(p5i) 8 (psi) l SR-59-I A Radiator Expansion Tank on Diesel 8 N/A 9.7 I.7 8.7 0.7 Operating pressure range is 6.5 to

! Engine 1 A1 8 psig SR-59-I A Radiator Expansion Tank on Diesel 8 N/A 9.7 1.7 8.7 0.7 Operating pressure range is 6.5 to Engine l'A2 8 psig SR-59-I B1 Radiator Expansion Tank on Diesel 8 N/A 9.7 1.7 8.7 0.7 Operating pressure range is 6.5 to Engine 1B1 8 psig SR-59-182 Radiator Expansion Tank on Diesel 8 N/A 9.7 1.7 _8.7 0.7 Operating pressure range is 6.5 to Engine IB2 8 psig SR-59-3A Start-up Air Tank I A4 200 N/A 213.4 13.4 191.4 -8.6 While rescat pressure is below maximum operating pressure,it is 56.4 psi above the minimum required pressure (135 psig)

SR-59-3 B Start-up Air Tank IB4 200 N/A 213.4 13.4 191.4 -8.6 While rescar pressure is below maximum operating pressure,it is 56.4 psi above the minimum required pressure (135 psig)

SR-59-4A Start-up Air Tank I A3 200 N/A 213.4 13.4 191.4 -8.6 While rescat pressure is below maximum operating pressure, it is 56.4 psi above the minimum required pressure (135 psig)

SR-59-4 B Start-up Air Tank 183 200 N/A 213.4 13.4 191.4 -8.6 While reseat pressure is below maximum operating pressure, it is 56.4 psi above the minimum required pressure (135 psig)

SR-59-5A Start-up Air Tank I A2 200 N/A 213.4 13.4 191.4 -8.6 While rescat pressure is below maximum operating pressure, it is 56.4 psi above the minimum r equired pressure (135 psig)

LCIIMENT I UNIT 1-EMERGE' / DIESEL GENERATOko -

" * * "5 nn.e.ans

..e...,t.

MAX VALVE DESIGN RESEAT OPER NUMBER RESEAT PRESS PRESS ' ^

(psi) -3 % PRESS MARGIN (PSI)

E MARGIN l gp,y) g gp,y) (P5i)

E (PSI)

SR-59-5B Start-up Air Tank 182 200 N/A 213.4 13.4 191.4 -8.6 While rescat pressure is below maximum operating pressure,it is 56.4 psi above the minimum SR-59-6A Start-up Air Tank I AI required pressure (135 psig) 200 N/A 213.4 13.4 191.4 -8.6 While rescat pressure is below maximum operating pressure,it is 56.4 psi above the minimum SR-59-6B Start-up Air Tank IBl required pressure (135 psig) 200 N/A 213.4 13.4 191.4 -8.6 While rescat pressure is beic.v maximum operating pressure,it is 56.4 psi above the minimum required pressure (135 psig) 4

____ _ __ _ _____ _ _ _-___ _ ____ _ ____ __--_-_________m - _ _ _

A cCIIMENT I '

UNIT I-INST' . DENT AIR SYSTEM ,

RD.9.885 rege 9 of it DESIGN DESIGN .

MAX DESIGN RESEAT ,

VALVE TRANS LIFT LIU OPER RESEAT PRESS ,

DESCRIPTION PRESS SETPT SETPT REMARKS NUMBER PRESS PRESS MARGIN i (psi) -3% MARGIN gp,.g) {p;g (psi) I gg g)

SR-18-6A Instrument Air to Maintenance Hatch l 30 0.3 34 3,7 30.5 0.5 Door Seal A SR-15-6B instrument Air to Maintenance flatch 30 0.3 34 3.7 30.5 0.5  :

Door Seal B i b

P h

i b

P

1

.CIIMENT I '

UNIT l-INTAKE (. JLING WATER SYSTEL -

• * * *5 n,.. iss l PageID efit MAX ' '

DESIGN RESEAT DESCRIPTION PRESS S PT S

^

BER pg g p , REMARKS 3

(psi) -3% MARGIN (psit) (Psig) (Psi) gp,g) gp,g)

SR-21-1 A CCW lleet Exchanger I A Inlet 45.5 4.6 87.3 37.2 78.6 33.1 SR-21-1 B CCW lleat Exchanger IB Inlet 45 4.5 87.3 37.8 _78.6 33.6 l

8

. IPN PSL-SENP-95-105 Rev.0 '

Page 1 or lo 1

1 9

ATTACHMENT 2

~

'"^ 5'N'~'5-5

. sCilMENT 2 JNIT 2-CIIEMICAL VG. sME AND CONTROL SL(EM ~ cw.e. ass Psee 2 el19 MAX DESIGN RESEAT DESCRIPTION PRESS SET T SETPT REMARKS HH p PFS R (psi) -3 % MARCIN (psig) (psig) (psi)

V2115 Volume Control Tank Outlet 65 N/A 72.75 7.75 65.25 0.25 VCT operates at a much lower (20 to 30 psig) and very rarely reaches 65 psig.

129 N/A 145.5 16.5 130.5 1.5 V2199 RCP Bleedo!Tto Quench Tank Primary Makeup Water to the Volume 75 N/A 145.5 70.5 108 33 V2311 Control Tank V2318 Charging Pump 2B Discharge to 75 50 145.5 20.5 108- 33 Equipment Drain Tank V2321 Charging Pump 2A Discharge to 75 50 145.5 20.5 108 33 Equipment Drain Tank V2324 Charging Pump 2 A,2B, and 2C 2413 N/A 2653 240 2379 -34 3 Pump Operation-The relief V2325 Discharge-3 pump operation valves will resent after the V2326 condition which caused the lift (solenoid valve closure)is cleared. The charging pumps are secured on isolation of the charging Seader by procedure.

V2345 Letdown Control Valve Station 500 50 582 432 Problems have been experienced l

{( with lifling this relicf valve due to pressure transients. 7here is an i

effort presently underway to

! resolve this issue.

V2446 VCT Inlet Downstream of V2512 75 N/A 194 119 144 69 V2447 VCT Inlet Upstream of V2512 110 50 194 34 144 34 V2531 Lerdown to lloidop Tanks Downstream 130 50 194 14 144 14 of FE-2202 V2588 Charging Pump 2C Discharge to 75 50 145.5 20.5 108 33 Equipment Drain Tank

UNI't 2-SAFET. .NJECTION SYSTEM -

~

" "E* *5 on. .35 r.en .r ie h1AX DESIGN DESIGN VALVE TRANS LIFT . LIFT DESIGN RESEAT DESCRIPTION OPER RESEAT PggSS NU5!BEH PRESS SETPT SETPT PRESS PRESS AfARGIN REhfARKS (psig) IPTI) -3Ya AfARGIN (Psig) (psg)

(psig) (psg)

V32tl Safety in.Jection Tank 2A2 570 57 649 22 582 12 93221 Safety injection Tank 2Al 570 57 649 22 582 12 V3231 Safety injection Tank 2BI 570 57 649 22 582 12 V3241 Safety injection Tank 2B2 570 57 649 22 582 12 j V3407 Safety injection Tank Outlet Drain to 570 57 630 3 468 183 Ili Pressure-SIT Outlet press airm l RWT V3412 Flowing Pressure is 285 psig IIPSI Pump 2B Discharge liigh Pressure 1271 127 1537/1600 139/202 II41/1204 Injection Mode Ileader Il98 120 219 Recire Mode Cap =5 gpm V3417 IIPSI Pump 2A Discharge fligh Pressure 2290 50 2329/2400 1737/1808 Alternate Chg/ Actual llender V3430 SDC lleat Exchanger 2B Outlet i271 431 _

127 30 n

4p ](3 ${ I IIPSI Post LOCA Recirc 485 24 435 4 V3431 SDC Ilest Exchanger 2A Outlet 43I 30 485 24 435 4 V3439 Low Pressure lleader A 479/462 30 485/510  ?.3. , . f 435/460 Design / Actual 436 After

• Note: flow is adjusted immediately Flow Adj I i afler pump start V3466 Safety injection Tank Outlet Drain to 600 60 679 19 504 -96 Check valve back leakage RWT protection. Only in service during SIT fill V3468 Loop 2B SDC Retum to LPSI Pump 2B 286 30 325 9 292 6 V3469 Loop 2B SDC Retum to Quench Tank 2250 0 2411 161 2162 -88 V3482 Loop 2A SDC Return to Quench Tank 2250 0 2411 161 2162 -88 V3483 Loop 2A SDC Return to LPSI Pump 2A 280 30 325 15 292 12 V3513 SDC lleat Exchanger 2B Outlet to 431 30 485 24 435 4 RWT V3507 Low Pressure lleader B 479/458 30

• 485/505 hp 435/455 Design / Actual l

1 436 After h,i' $ Note: flow is adjusted immediately Flow Adj V3570 Alt. Charging Feed to SI t

lit @ P a fter pump start 1274 127 2329 928 1729 455 V3667 Loop 2A SDC Return to Sump 278 30 325 17 292 14 V3666 Loop 2B SDC Retum to Sump 278 30 325 17 292 14 ,

l

~

1. " ' " * 8 A ACllMENT 2 UNIT 2-CONTAl. . DENT SPRAY SYSTEM on.e.sm rege 6 of it DESIGN DESIGN MAX DESIGN RESEAT TRANS LllT LIU PRESS OPER RESEAT VALVE PRESS SETPT SETPT REMARKS DESCRIPTION PRESS PRESS MARGIN f NUMBER (psi) -3% MARGIN gp,gg ) {p,;g) (psi) gpg;)

25.7 2.6 58.2 29.9 55.2 29.5 SR-07-1 A LPSI and llPSI Pump 2A Suction 25.7 58.2 29.9 55.2 29.5 SR-07-1 B LPSI and ilPSI Pump 2B Suction 2.6 _

1.5 19.4 2.9 18.4 3.4 SR-07-IC liydrazine Storage Tank 15 25.7 2.6 58.2 29.9 55.2 29.5 SR-07-2A flydrazine Pump 2A Discharge 25.7 2.6 58.2 25.0 55.2 29.5 SR-07-2B llydrazine Pump 2B Discharge t

4 e

" " "-5

^ ACllMENT 2 UNIT 2-EMERGEI\ / DIESEL GENERATOR 5 ,

Ra.8,SS$

r.u t or ie MAX DESIGN RESEAT TRANS LIFT LIFT VALVE OPER RESEAT PRESS DESCRIPTION PRESS SETPT SETPT REMARKS NUMBER PRESS PRESS MARCIN (psi) -3% MARGIN .

(psig) (PSig) (P5i)

(psig) (psi)

SR-17-221 Diesel Oil Transfer Pump 2A Discharge 82 N/A 97 15 92 10 Relief valve not required. System pressure never exceeds pump shutofThead which is less than the relief valve serpoint.

SR-17-222 Diesel Oil Transfer Pump 2A Discharge 82 N/A 97 15 92 10 Relief valve not required. System pressure never exceeds pump shutoff head which is less than the relief valve setpoint.

200 N/A 213.4 13.4 191.4 -8.6 While rescat pressure is below SR-59-3A Start-up AirTank 2A4 maximum operating pressure,it is 62.4 psi above the minimum required press (129 psig) 200 N/A 213,4 13.4 191.4 -8.6 While rescat pressure is below SR-59-3 B Stan-up Air Tank 2B4

> maximum operating pressure,it is 62.4 psi above the minimum required press (129 psig) 200 N/A 213.4 13.4 191.4 -8.6 While rescat pressure is below SR-59-4A Start-up Air Tank 2A3 maximum operating pressure,it is 62.4 psi above the minimum required press (129 psig)

SR-59-4 B Start-up Air Tank 2B3 200 N/A 213.4 . 13.4 191.4 -8.6 Whi'a rescar pressure is below maximum operating pressure, it is 62.4 psi above the minimum required press (129 psig)

SR-59-5A Start-up Air Tank 2A2 200 N/A 213.4 13.4 191.4 -8.6 While rescat pressure is below maximum operating pressure,it is 62.4 psi above the minimum required press (129 psig)

/ CIIMENT 2 UNIT 2-EMERGEP

' DIESEL GENERATOR. -

" * * '5 te e.sss rc r se MAX ' '

TRANS DESIGN RESEAT VALVE OPER LIFT LIFT DESCRIPTION PRESS RESEAT PRESS NUMBER SETPT SETPT REMARKS PRESS PRESS MARGIN (psi) -3% MARGIN i (Psit) .

(Psit) (Psi)

(psig) (psi) l SR-59-5B Start-up Air Tank 282  ;

200 N/A 213.4 13.4 191.4 -8.6 While rescat pressure is below i maximum operating pressure, it'is 62.4 psi above the minimum I required press (129 psig)

SR-59-6A Start-up Air Tank 2AI 200 N/A 213.4 13.4 191.4 -8.6 While rescat pressure is below maximum operating pressure,it is  !

62.4 psi above the minimum ,

required press (129 psig)

SR-59-6B Start-up AirTank 2BI 200 N/A 213.4 13.4 191.4 -8.6 While rescat pressure is below  !

maximum operating pressure, it is i 62.4 psi above the minimum l required press (129 psig) i

_ . _ _ . _ _ _ _ _ _ _ - - - - . - - - - - - - - - - - - - - - - - - - - - '~~- -- -- -

i

/ . CHM ENT 3 UNIT 2-INSTI .4ENT AIR SYSTEM -

'" -" * 5

, Rev. 0,0/95 Page 9 ofit MAX DESIGN RESEAT

^'

DESCRIPTION p, PRES S PT S PT ^

BE 3 P FSS MAR N  ;

(psi) -3% MARCIN (Psig) (psig) (psi) g ) (p,,)

SR-18-6A Instrument Air to Maintenance Hatch 30 0.3 34 3.7 32.2 2.2 Door Seal A SR-18-6B Instrument Air to Maintenance Hatch 30 0.3 34 3.7 32.2 2.2 Door Seal B l

i i

. _ . _ _ . _ . _ . _ _ _ _ _ _ _ . . . _ . _ _ - . _ _ _ . . _ . . _ . _ . _ . _ . - . _ . . . _ ~_ . _ _

~

. .CHMENT 2 UNIT 2-INTAKE C JLING WATER SYSTEL -

~

" 5" "

m. ws -

Page18efle MAX DESIGN RESEAT

^ REMARKS DESCRIPTION PRESS SETPT S PT NUMBER PRESS PRESS MARGIN (psi) -3% MARGIN (Psig) (psig) (psi)

(p,,g) {p,,)

SR-21-196 CCW lleat Exchanger 2A Inlet 45 4.5 87.3 37.8 82.9. 37.9 SR-21-243 CCW ileat Exchanger 2B Inlet 45 4.5 87.3 37.8 82.9 37.9

JPN-PSL-SENP-95-1 5 Rev.0 Page1of5 t

ATTACHMENT 3

~~ - - -

. T A CHMENT 3 ST.Lt IE UNIT I SAFETY RE TED RELIEF VALVE A 'I0N PLAN 3*'

• ca.e,nss

'5 Page 2 ef 5 k

RESEAT ACTIONS

^'

PRESS OPERABILITY IMMEDIATE DULLING THE VALVE DESCRIPTION MARGIN ISSUE ACTIONS PRIOR NEXT FUTURE PLANS NUMBER MARGIN EVALVU l ADDRESSED TO STARTUP REFUELING (PSI) ^

Des /Act OUTAGE Des /Act V2324 Charging Pump I A, IB, and IC 50 -157 NO -

Revise design None None V2325 Discharge-3 pump operation setpoint to reflect V2326 actual backpress-MEP issued 8/25/95 Reset valves accordingly-MM V2345 Letdown Control Valve Station 32 -68 NO -

Replace velve-MM None Monitor perfomiance V3412 IIPSI Pump IB Discharge High Pressure 194/261 -105/-38 NO -

-Prepare EP to None Norie IIcader modify design lift setpoint from 1735

o I750 psig and revise blowdown from 25% to 10%

EP issued 8/27/95 Replace valve-MM V3417 IIPSI Pump I A Discharge High Pressure -12/69 -562/-481 YES STAR l-950996 Perform procedure None Nore llender was generated to evaluation and address operability recommend changes of the as modified to ONOPs and EOPs negative rescat STAR Disposition margin on V3417 Issued 8/28/95 -

(-254 Design -79 Prepare EP to Acnal)-STAR modify design lift Disposition Issued setpoint from 2400 '

8/28/95 to 2485 psig and reduce blowdown from 25% to iIW EP issued 8/26/95 Replace ~ valve-MM

.CHMENT3 '"' " * 5 A

ST. LL lE UNIT I SAFETY ilE. _TED RELIEF VALVE Au'JONPL N Rn 8.8;95 PageJ of5 RESEAT ACTIONS PRESS OPERABILITY IMMEDIATE DURING THE

^ DESCRIPTION MARGIN ISSUE ACI'lONS PRIOR NEXT FUTURE PLANS NUMBER MARGIN EVALVU ADDRESSED TO STARTUP REFUELING (psi) ATION?

OUTAGE Des /Act V3468 Loop IB SDC Retum to LPSI Pump IB I/15 -1/13 NO -

None-Actual margin implement the None is positive recommendations of STAR 950430-EP LaDuca 10/1/95 Y3483 Loop I A SDC Retum to LPSI Pump i A I/20 -l/18 NO - None-Actual margin implemen't the None~ - -

is positive recommendations of  ;

STAR 950430-EP LaDuca 10/1/95

A .CitMENT 3 ST. LL JE UNIT 2 SAFETY RE. .TED RELIEF VALVE Au ilON-PLAN *[ ]

r ec 4.t5 RESEAT ACTIONS LIFT OPERABI DURING Tile PRESS OPERABILITY

^ ^ NEXT FUTURE PLANS DESCRIPTION MARGIN ISSUE MARGIN EVALVU ACTIONS NUMBER E' ^

(psi) ATION? OUTAGE Des /Act Des /Act 32 -68 NO - None-improvements implement the RV Monttor V2345 Letdown Control Valve Station have been made on changes made on performance letdown control. Unit I-EP LaDuca 10/1/95

-130/-67 YES Perform operability Oone Revise blowdown None V3412 IIPSI Pump 2B Discharge liigh Pressure 139/202 evaluation from 25% to 10%

lleader considering existing EP Krumins lin margins. 10/l/95 Recommend actions Eval JPN-PSI-SENP-95-105 issued 8/27/95

-11/60 -553/-482 YES Perform operability Perform procedure Modify design lia None V3417 IIPSI Pump 2A Discharge High Pressure evaluation evaluation and serpoint from 2400 lleader considering existing recommend changes to 2485 psig and lin margins-Eval to ONOPs and EOPs revise blowdown JPN-PSI SENP-95 STAR Disposition from 25% to 10 105 Issued 8/27/95 Issued 8/28/95 EP Krumins 10/l/95

-24/18 -l/24 YES Perform operability Aone Increase design None V3439 Low Pressure Header A evaluation serpoint from 500 to considering existing 535 psig-EP Neff f, liR margins.-Eval 10/1/95 I JPN-PSI SENP-95 105 Issued 8/27/95 l

.CHMENT3 . TED RELIEF VALVE As ilON. PLAN " ** '5 ST. LL _ lE UNIT 2 SAFETY RL an. e,s,+s Page 5 of 5 DESIGN RESEAT ACTIONS LIFT OPERABI DURING THE I

PRESS OPERABILITY VALVE SETFT LITY IMMEDIATE ,

DESCRIPTION M 4RCIN ISSUE NEXT FUTURE PLANS NUMBER MARCIN EVALVU ACTIONS (psi) ADDRESSED REFUELING }

(psi) ATION?

Des /Act OUTAGE  ;

Des /Act V3507 Low Pressure Header B -24/17 -l/19 YES Perform operability None ;ncrease design None evaluation setpoint from 500 to  ;

considering existing 535 psig-EP Neff  !

lift margins. 10/1195 Recommend actions

-Eval JPN-PSI- j SENP-95-105  ;

Issued 8/27/95 {

i i

t l

I I

l Int:r-Offico C rrzp nd:nco L

FPL 1

JPN-SPSI 95-0334 4 l

l o: S. A. Valdes cate: August 30,1995 St. Lucie Plant I rros o.partment: JPN/PSL D. J. O enver so f

, Nuclea Engineenng  !

subjects ST. LUCIE UNITS 1 AND 2 DESIGN REVIEW OF SAFETY RELATED 1 RELTEF VALVES- JPN-PSI SENP-95-105 Based on problems experienced on relief valves V3439 and V2345 on Unit 1, Engineering )

initiated and completed a review of Safety Related relief valves for Units 1 and 2. The results l

of that review have been incorporated into Engineering Evaluation JPN-PSL-SENP-95-105 which is attached. Note that allimmediate en@eering actions prescribed by this evaluation have l been completed. This completes the actions assigned on STAR 0-950943. STAR l-950430 will track the follow-on activities on Unit 1. A separate STAR is being generated by Engineering to track implementation activities on Unit 2.

Ifyou have any questions, please contact S.T. Hale at Juno extension 3507 or PSL site extension 3634.

STH/

Copies: J. LaDuca (wll)- PEG /JB D. Wolf (w/l)- PEG /JB K.K. Mohindroo (w/1)- JPN/PSL J. Zudans (w/l) - PEG /JB G.A. Pustover (w/l)

S. Khurana (w/1)

H.N. Paduano (w/l)

IWinnard (w/1)

R." Church (w/l)

J. Scarola D.A. Sager J. Marchese W.H. Bohlke E. Benken 9406ac LTR g60}C