ML19220C734

Forwards Viewgraphs Used at Commission Meeting

ML19220C734
Person / Time
Site:	Crane
Issue date:	04/01/1979
From:	Eisenhut D Office of Nuclear Reactor Regulation
To:	NRC COMMISSION (OCM)
References
NUDOCS 7905140112
Download: ML19220C734 (7)

Text

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50-320 Vugraphs used at a Commission briefing given by Mr. Eisenhut, NRR, late March or early April 7 9 0 514 o I g7_

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SIMPLIFIED RCS/ STEAM / FEED SYSTEMS

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sf PRES.

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GEN IBINE gh rS

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COND.

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CLE UP CONDENSATE SYSTEM FEED PUMPS PUMPS RCP(2)

RCP(2)

Elt1ERGENCY FW PUMP I

CST RIVER p

WATER

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e IE BULLETON 79-05A (4/5/79)

• Re-Verify Emergency Feedwater Valves: Are Open a if High Pressure Injection (HPI) Activates on Low Pressure, Do Not Turn Off Until:

A. 2 LPI Have Been Working For 20 Minutes, or B. HPI Operates For.20 ' Minutes, & Until TC nd T!H Are 50o Below TSAT i

If HPI Activates and Main Reactor Coolant Pumips Are on, at Least One RCP Per Loop Should be Maintained

• In Transients, Pressurizer Level Instrumientation Should Not be Relied Upon Alone - Use Reactor Pressure as Well.

g If ECCS Activates, the Reactor Containment Should be Isolated.

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SIMPLIFIED RCS/ STEAM / FEED SYSTEMS Fin sp PRES.

RELIEF V PRES.

VA BYPASS VALVE

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GEN BINE

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PUMPS PUMPb RCP(2)

RCP(2)

Ed1ERGENCY FW PUMP CW CST HIVER WATER 4-c

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PRES.

RELIEF V PRES.

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GEN BlNE (h

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CONDENSATE SYSTEM O

FEED PUMPS PUMPS

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RCP(2)

RCPl2)

Ed1ERGENCY FW PUMP CST RIVER WATER LD 4

i SIGNIFICANT EVENTS Emergency Feedwater System Redundant Flow Blocked Electromatic Relief Valve Appears to Have Failed to Open ECCS Appears to Have Been Turned Off Prematurely Pressurizer Level Indicators Appear to Give Erroneous Readings Recovery Actions (RCP Tripping) Increased Fuel Damage Containment Did Not Isolate on ECCS Actuation 4

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NRC INTERIM ACTIONS IE BULLETIN 79-05 (4/1/79)

• Describes TMI Accident Requires Review by B&W Plants (10-Day Report)

- TMI Accident

- Davis-Besse Transient

- Any Similar Transients at Their Facility

- Safety-Related Valve Position

- Procedures

- Safety Feature Override

- Transfer of Liquid and Gases

- T&M - Valve Positions h

- Administrative (Prompt Reporting)

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