ML16340B191
| ML16340B191 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 07/29/1980 |
| From: | Kendall R Office of Nuclear Reactor Regulation |
| To: | Satterfield R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML16340B189 | List: |
| References | |
| NUDOCS 8010230629 | |
| Download: ML16340B191 (10) | |
Text
t UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 JUL 29 88a MEMORANDUM FOR:
R.
M. Sat ter fiel d, Chief Instrumentation 8 Control Systems
- Branch, DSI THRU:
FROM:
SUBJECT:
M. Srinivasan, Section Leader Instrumentation
& Control Systems
- Branch, DSI R. Kendall Instrumentation 5 Control Systems
- Branch, DSI MiEETING
SUMMARY
- DIABLO CANYON 1
8 2, AFWS AUTOMATIC INITIATION AND FLOW INDICATION (ACTION PLAIN ITEM II.E.1.2)
On July 25,
- 1980, members of the staff met with representatives of Pacific Gas and Electric Company (applicant) in Bethesda, Maryland.
The ICSB's purpose for attending the meeting was to discuss the conformance of the Diablo Canyon auxiliary feedwater system (AFWS) design to the long term (safety grade) requirements of NUREG-0578, Sections 2.1.7.a (Automatic Initiation of the AFWS) and 2.1.7.b (AFWS Flow Indication).
The results of the meeting are summarized below.
The applicant addressed questions prepared by the staff regarding the automatic initiation of the AFWS and flow and steam generator level indication.
Specific areas addressed with regard to automatic initiation were the use of operational bypasses and the power sources for tpe four level control valves (LCY) in the AFWS flow lines.
Tpe appl.icant stated that there is one operational bypass associated with the trip of both main feedwater pumps which is r moved
'dministratively.
The power for each LCY is from the same emergency bus which supplies the corresponding auxiliary feedwater pqmp.
The staff indicated tha the automatic initiation system for the Diablo Canyon, Units 1 and 2 AFWS satisfied the safety grade requirements.
The applicant was provided with a clarification (Enclosure
- 1) regarding auxiliary feedwater flow indication to the steam generators The applicant sn ica e
e d'
d th flow indication and steam generator wide range level indication were uporaded to safety grade requirements, although not sn terms independence (e.g., physical separation).
The staff did not agree that this indication was safety grade since most areas of the clarification have not yet been addressed.
The staff is particularly concerned that all four wide range level channels (1 channel per steam generator) are powered from the same vital bus.
The staff concluded that a final determination of the acceptability of the AFWS flow and steam generator level indication could not be made until further documentation was received.
A list of attendees is enclosed.
R. Kendall Instrumentatioh 8 Control Systems
- Branch, DSI
Enclosures:
As stated
">>0800
. QgP
Y
AU>;ILIARY~l.01'ATCR FLOW I>'OICATIO" T~ EAN GEliEPATORS II.E.1.2 POSITIOIi A
t f the Lessons Learned recommendations
- 2. 1.7.b the Fl b
he Flow Indication for the Auxiliary Feedwater System must be upgraded in s par o
e e
raded iri accordance with'afety grade requirements."
CLARIFICATION Th t t of this recommendation is to ensure a reliable indication of e in en auxiliary feedwater system performance.
This an overall indication system >>hich meets appropriate design p'rincip es ou ine in IEEE 279-I971.
The staff has determined that the overall flow indication system should meet the following criteria:
1.
For BAH plants to satisfy these requirements they must provide as a
minimum:
a.
T>>o AFH flow indicators for each steam generator.
Z.
For Westinghouse and Combustion Engineering plants, or ie n
ts to satisfy these requirem 'nts they must provide as a minimum; One AFH flow indiqator for each steam generator an
- and, two Wi de Range level indicators for each steam generator.
3.
For (4 loop) plants with 4 vital buses the following option is acceptable.
a.
One AFW flow indicator for each steam generator.
b.
One Hide Range (Lo Lo Level) indicator for each steam generator; c.
Two Mari ow Range (Hi Level) indicators for each steam generator.
ust be ustified based on overall 4.
For all plants, specified accuracies mus J
system requirements including po'st-accident monitoring.
ocumen a
demonstrate that these accuracies are met by the system propose d t th taff has determined that the following salient paragraphs In addition, e s a
s stem design.
of IEEE 279 should be met; in the flow indication sys g
I EEE PARAGRAPH 4.1*
General Functional Requirements
4.2" Single Failure 4.3, 4.4 gualificat.ion 4.6 Channel Independence 4.7 Control and Pn)tect.ion System Interaction 4.9*, 4, IO*
Capability for Testing "These requirements were part of the short term control orade requiretrents
~
J 4
pi P
J pg AVPL } CAB} L }TY Al 1 Pl"Rs
}hPLEhENTAT}ON DATE January 1981 TYPE OF REV}EM NRR Pre-Implementation Review DOCUl1ENTAT }ON R~EU} RED Each licensee/applicant shall provide docum ntation sufficient to support a
reasonable assurance finding by the NRC that the above requirements are m t.
The documentation should include as a minimum:
1.
A discussion of the design with respect to the above paragraphs of }EEE 279.
Support information including system design description, logic diagrams,'.
electrical schematics, piping and instrument diagrams, test procedures, and technical specifications.
~(
TECHNICAL SPEC}F}CAT}ON CHANGES RE UIRED (Yes)
REFERENCES NUREG-0578 Section
- 2. l.7.b
I I
IJ
IST OF ATTENDEES NRC K. Jabbour R. Kendall D. Thatcher J. Stewart N. Hyler J. Merniel M. Cunningham A. Lakner
- 0. Parr L. Huang J.
Page PG8E R. Breed G. Moore R. Fray D. Bley R.
Kelmenson B. Lew Westin house E. Murphy FRC K. Fertner G. Overbeck
V'
MEETING SUII~IRIIY DIS fRII3UTIOll Docket File HRC PDR Local PDR TIC/I'ISIC/Tera HRR Reading LBilI Reading fl. Denton E.
Case D. Eisenhut R. Purple B. J.
Youngblood A. Schwencer F. Niraglia J. Miller G. Lainas R. Vollmer J.
P. Knight R.
Bosnak F. Schauer R.
E. Jackson Project Manager
- Attorney, OELD M. Rushbrook OIF. (3)
ACRS (16)
R.
Tedesco J.
Lee B. C. Buckle~
N C~P R.
Kendall K. Jabbour D. Thatcher J.
Stewart W. Hyler J.
Wermiel M. Cunningham A. Lakner
- 0. Parr L.
Huang J.
Page bcc:
Applicant 5 Service List G.
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Lea r Hoonan Pawlicki Bonaroya Rosztoczy Haass llul 1 er Bal 1 ard
'Regan Ross Check Sa tte rf'iel d Pa) r Rosa Butler
'Kreger Houston I'.
D.
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(i, Schroe(ler Skovl>(>lt Frns t Baer Be>linger K(ll(?1 Kni(Jh I,'on A. 1'ha(lani D. Tondi tlurphy L. Rubenstein T. Speis W. 'Johnston J.:S tol z S. Ilanauur W. Gammill