bnpp@nppd.co.ir inbox

From: "Emergency Drill"
To: bnpp@nppd.co.ir
Sent: Thursday, January 24, 2019 12:36:48 PM
Subject: Emergency drill - No action required

THIS IS A DRILL – THIS IS NOT A REAL EVENT – THIS IS A DRILL

NO ACTION REQUIRED

Event Notification Report – Plant name

Notification 1 – Date: 23-01-2019

Plant name:

Onagawa

Plant owner:

Tohoku EPC

Unit(s) affected:

Unit 2

Reactor type(s):

BWR

Event date:

23/01/2019

Event time (UTC/local time):

23:30/08:30

What happened:

23:30/08:30 Earthquake hit station, reactor was shut-down
automatically, Feedwater pumps were not available due to tripped due to Loss of Power Accident (LOPA) ?? (what is LOPA?)

23:34/08:34 Residual Heat Removal system was unavailable pumps tripped on channel A . Main Steam Isolation valves (MSIVs) were closed.

23:50/08:50 Residual Heat Removal system was unavailable pump tripped on channel B
On-site Emergency declared

00:50/09:50 Reactor Water Injection system was not available due to failure . Depressurisation of reactor is impossible due to inoperable Safety Release Valve (SRV) . pumps tripped
Off-site Emergency declared .

01:52/10:52 SRV opened and reactor was depressurised .

01:54/10:54 Start water injection into reactor by Make-Up Water (MUW) system and reactor water level was recovered. Emergency terminated.

Reactor status:

Subcritical

Consequence(s) of the event:

Due to loss of reactor core cooling – fuel assemblies might be damaged Loss of reactor core cooling

Event classification:

Off-site emergency

Why this event notification?

You are receiving this event notification report because you are a WANO member and are on the WANO event notification distribution list. This report is classified as Limited Distribution.

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THIS IS A DRILL – THIS IS NOT A REAL EVENT – THIS IS A DRILL

NO ACTION REQUIRED

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--
Sincerely Yours
Rasoul Mahmoudi
Manager of Managing Director Office,
Public Relations & International Affairs

Add: Nuclear Power Plant, Bushehr, Iran
P.O.Box: 75181/111
Tel: +98 77 3111 2585
Fax: +98 77 3111 2710
Personal Email: Mahmoudi@nppd.co.ir