ML20212M135

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Forwards Addl Equipment Needed to Achieve RHR Operating Conditions Following Postulated Safe Shutdown Earthquake, Per 771122 Meeting W/Util & Westinghouse in Bethesda,Md to Discuss Plant Sys Required to Shut Down Facility
ML20212M135
Person / Time
Site: 05000000, Diablo Canyon
Issue date: 12/08/1977
From: Israel S
Office of Nuclear Reactor Regulation
To: Bosnak R
Office of Nuclear Reactor Regulation
Shared Package
ML20150F500 List: ... further results
References
FOIA-86-391 NUDOCS 8608250387
Download: ML20212M135 (5)
v • d • e


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t Docket Nos. 50.g75,3g3 MEMORANDUM FOR:

R. Bosnak, Chief, Mechanical Engineering Branch, DSS THRU:

T. M. Novak, Chief, Reactor Systems Branch, DSS FROM:

S. L. Israel, Section Leader, Reactor Systems Branch, DSS

SUBJECT:

EQUIPMENT NEEDED TO ACHIEVE RHR OPERATING CONDITIONS AT DIABLO CANYON On November 22, 1977 a meeting was held in Bethesda with representatives of Pacific Gas and Electric Company (PME), Westinghouse, and the !!RC staff to discuss plant systems required to shutdown Diablo Canyon following a Safe Shutdown Earthquake (Hosgri event). As a result of this meeting, additional equipment have been identified to achieve RHR operating conditions following a postulated SSE.

The basic functions that must be performed following scram and loss of offsite power are:

a heat remvoal b steam generator depressurization c boration d primary system depressurization g

i e sdrve111ance of boron concentration l

f surveillance of primary and secondary system parameters The applicant will justify in a future amendment that degasification and letdown of the primary system are not required to achieve RHR operation.

Our review of the systems required to carry out these functions included i

single failure considerations.

In this regard, we limited operator action outside of control room to local actuation or isolation of systems not i

requiring continuous modulation. The applicant will provide modifications to the components that do not have safety-grade operators.

The following equipment (other than valves) are required for a safe shutdown i

in addition to those components identified in Table 7.5 of Amendment 56.

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Contact:

Glenn Kelly, NRR 49-27591-772980191 8608250387 860001 PDR FOIA PDR kwnes *

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1. Condensate storage tank
2. Motor-driven auxiliary feedwater pumps
3. Raw water storage reservoir
4. Refueling water storage tank
5. Boric acid tank heaters l

The following instrumentation are also required:

1. Steam generator level
3. Pressurizer level
3. Primary system pressure i
4. Primary system temperature
5. Boric acid tank level The active valves presented in Enclosure 1 are required in addition to those identified in Table 7-7 of Amendment 56.

The applicant previously submitted piping schematics that were color coded to indlodee lines that must not fail during an SSE. Enclosure 2 lists schematics of fluid lines in essential systems needed to achieve RHR operating conditions. MEB should verify that open passive valves in the color coded lines will not close because of SSE loads, or that closed isolation valves will not open.

Original signed by:

b Sanford L. Israel, Section Leader Reactor Systems Branch Division of Systems Safety

Enclosures:

As Stated cc:

D. Ross i

J. Stolz i

D. Allison V. Benaroya T. Ippolito i

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g ENCLOSURE 1 ACTIVE VALVt3 TO BE ALGED 10 TABLE 7-7 1.

MOV LCV 106 Dwg 3.2-03, Sht 2 2.

MOV LCV 107 Dwg 3.2-03, Sht 2 3.

M0V LCV 108 Dwg 3.2-03, Sht 2 4.

MOV LCV 109 Dwg 3.2-03, Sht 2 5.

M0V FCV 95 Dwg 3.2-04, Sht 1/4 6.

MOV FCV 152 Dwg 3.2-04, Sht 1/4 7.

MOV FCV 15 Dwg 3.2-04, Sht 1/4 8.

Electro-hydraulic LCV

.110 Dwg 3.2-03, Sht 2 9.

Electro-hydraulic LCV 111 Dwg 3.2-03, Sht 2 10.

Electro-hydraulic LCV 113 Dwg 3.2-03, Sht 2 11.

Electro-hydraulic LCV 115 Dwg 3.2-03, Sht 2

12. MOV FCV 437 Dwg 3.2-03, Sht 2
13. MOV FCV 436 Dwg 3.2-03, Sht 2
14. Air Operated 8145 Dwg 3.2-08, Sht 4
15. Air Operated HCV 142 Dwg 3.2-08, Sht 4
16. MOV 8805A/B Dwg 3.2-09, Sht 2 g
17. Air Operated PCV 455C Dwg 3.2-08, Sht 4
18. Air Operated PCV 456 Dwg 3.2-08, Sht 4
19. Air Operated PCV 474 Dwg 3.2-08, Sht 4
20. Air Operated 8146 Dwg 3.2-08, Sht 4
21. Air Operated 8147 Dwg 3.2-08, Sht 4 22.

9356A Dwg 3.2-11 23.

9351A/B Dwg 3.2-11

24. MOV FCV 355 Dwg 3.2-14, Sht 1,2,3,8
25. Air Operated FCV 364 Dwg 3.2-14, Sht 1,2,3,8
26. Air Operated FCV 365 Dwg 3.2-14, Sht 1,2,3,8
27. MOV FCV 41
28. MOV FCV 42
29. MOV FCV 43
30. MOV FCV 44

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ENCLOSURE 2 ESSENTIAI. PIPING St:T 4 TICS e

Heat Removal (Auxfeed System)

Dwg 3.2-16, Sht 8 Dwg 3.2-03, Sht 2 Dwg 3.2-04, Sht 1 Dwg 3.2-04, Sht 4 Steam Generator Depressurization Dwg 3.2-04, Sht 1 3.2-04, Sht 4 Boration Dwg 3.2-08, Sht 4 (Additional lines) 3.2-08, Sht 7 3.2-09, Sht 2 Primary System Depressurization N

Dwg 3.2-07, Sht 2 (Additional lines) 3.2-08, Sht 4 (Additional lines) 3.2-08, Sht 7 3.2-09, Sht 2 Boron Concentration Surveillance Dwg 3.2-11 (Lines to be added)

RHR System Dwg 3.2-09, Sht 3 3.2-10, Sht 1 MTA-E-3p/"

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ENCLOSURE 2--continued CCW System Dwg 3.2-14, Sht 1 3.2-14, Sht 2 3.2-14, Sht 3 3.2-14, Sht 8 Salt Water System Dwg 3.2-17, Sht 1 i

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$ 47

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