ML19317F889

RO-77-03:on 770216,RCS Drain Tank Found Partially Collapsed, Cracking One Attached Inlet Line.Caused by Vacuum in Tank Due to Improper Ventilation.Sys Design Possibly Will Not Permit Safe Venting Due to Hydrogen Concentrations

ML19317F889
Person / Time
Site:	Rancho Seco
Issue date:	03/23/1977
From:	Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:
Shared Package
ML19317F888	List: ML19317F887 ML19317F889
References
NUDOCS 8002210617
Download: ML19317F889 (1)

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UCENSEE EVENT REPOf '

• CONTROL 8 LOCK:l l

l l

l l

l (PLEASE PRINT ALL REGulRED INFORMATION)

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1 8

AM UCENSE NUMBER T PE TY E I cl Al al si si il 1010 l-l 01 Ol 01 0l 0 l-( 0101 141 ilililil I oli l 7 89 14 15 25 26 33 31 32 CAMGQRY TYPE SC DOCKET NUMBER EVENT DATE REPORT DATE hCONT l P l 0 l l Ll lL l l0 l 5 l 01-l 0 l 3l 1l2 l l ol 2 l 116 l 7 l 7l l0 l 3 l 2 l 3 l 7 l 71 7 8 57 58 59 60 81 88 89 74 75 80 EVENT OESCRIPTION HE l High radiation levels on the decav heat pumo room gas radiation monitor 1ed to l

7 89 80. I.

gg l discovery of the partially collapsed Reactor Coolant System Drain Tank. A temporary l 9 7 89 g l line bypasses the tank and a permanent fix will cut out and replace damaged sections.80l

\\7 89 80 -

gg l Da= aged line allowed monitored but uncontrolled release of radioactivity. A temporary l 7 88 bypass line installed after discovery of the tank violated containment isolation 8j g

7 89 80

pau, 00E CCMpoNENT CCOE ACTURER VOLATON gE l Ml Al ]

l Vl El Sl Sl E l L l lAl l Xl 9l 9l 9l l Yl 7 89 10 11 12 17 43 44 47 48 g

CAUSE DESCRIPTION r) gg 8 'Ihe tank was not properly vented, resulting in a vacuum in the tank' It is.possible l HE f that system design will not permit safe venting due to hydrogen concentrations.

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7 89 80 I

I f' 89 80 ST 4 POWER OTHER STATUS O CVERY OSCCVERY DESCRATICN Q

y l 1l 0l0 l l NA l ]

l NA l

7 8 9

10 12 13 44 45 48 60 R

Q O

{

]ASE l Fnimum 8 99 C1 total l lAuxiliaryBuildingVent l

AMOUNT OF ACTMTV LOCAT10N CP RELEASE

,s i

7 8 9

10 11 44 45 80,

PERSONNEL EXPOSURES NUMBER TY PE DESCRWTON Q l 0l1 l1l J l Maximum of 0.296 man rem total; maximum individual exposure 20 m/ rem l 7 89 11 12 13 80 PEBSONNEL INJURIES NUMBER CESCRIPTON Q l0l 0l0l l NA l

7 89 11 12 80 OFFSITE CONSEQUENCES

]g l Maximum 50 mile population dose of 0.0035 man rem l

7 89 80 LOSS OR DAMAGE TO CACIUTY TYPE DESCR8tlCN D2 d l RCSDT walis were damaged and will be repairei. Lines attached to tank damas.,ed. l 7 89 10 80 PUBLICITY M l Local newspapers notified March 3, 1977 l

7 89 80 ADDITIONAL FACTORS

] l requirements.

(R0 77-3) l g

!89 80 v

g o e s 21o f/ '7 DE I I

7 89 80 o

sedud NAME:

PHONE:

GPO 985 667

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