ML20054J986
| ML20054J986 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 06/14/1982 |
| From: | MISSISSIPPI POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML20054J949 | List:
|
| References | |
| 05-1-02-III-1, 5-1-2-III-1, NUDOCS 8206300268 | |
| Download: ML20054J986 (4) | |
Text
.
PLANT OPERATIONS MANUAL Volume 05 05-1-02-111-1 Section 02 Revision:
10 Date: 6-14-82 0FF-NORMAL EVENT PROCEDURE INADEOUATE DECAY HEAT REMOVAL SAFETY RELATED Prepared:
by Reviewed:
/
/
o F NucleHr Plant Quality $6'perTntendent hnrca'l Review -
e-3 Approved:
4 OperationsSperin dent Concurrence:
7 Assista Plant Tia' ag PSRC:
g/#
r-
/ /
-~z
[
of Effective Pages:
List
...Page:
-d:
1-3
~
List of TCN's Incorporated:
Revision TCN No 10 None 8206300268 820625 PDR ADOCK 05000416 P
[GRANDCULFNUCLEARSTATION OFF-NORMAL EVENT PROCEDURE l
Title:
Inadequate Decay Heat lNo.:
05-1-02-III-1 l Revision:
10 lPage:
1 l
l Removal l
l 5
1.0 PURPOSE / DISCUSSION 1.1 The purpose of this procedure is to provide instructions to assure adequate decay heat removal capability exists, and that accurate core coolant temperature indication is maintained.
1.2 This procedure may interface with Emergency Procedures.
1.3 Immediately following reactor shutdown, sensible and decay heat must be considered. Under normal circumstances, sensible heat will cease to be j
significant factor after approximately 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.
A reduction in decay heat removal capability could be caused by a loss of process cooling and/or insufficient core circulation.
The RHR shutdown cooling mode could be lost or inhibited by a single failure (closure or fail to open) of E12-F008 or F009.
For other RHR component failures, a redundant component or loop could be utilized.
Technical Specifications ~ relevant to this procedure are specified in sections 3.4. 9.1, 3.4. 9.2, 3.4.1.4, and 3.4.6.1.
y 2.0 SYMPTOMS 2.1 -Undesired increased in reactor coolant temperature.
2.2 A malfunction of.an RHR or SSW component associated with the shutdown cooling mode of RHR.
]
'~
2.3 RHR flow less than 5000 gpm while in shutdown cooling.
2.4 Loss of the reactor recirculation pumps while in shutdown cooling.
2.5 Steaming evidenced from head vents, even though reactor coolant temperature indicates less than 212*F.
~
2.6 RPV pressurization while in cold shutdown.~-
3.0 AUTOMATIC ACTIONS NONE 4.0 IMMEDIATE OPERATOR ACTIONS 4.1 Identify the component failure causing loss of cooling capability or core coolant circulation.
4.2 Check Reactor coolant temperature and vessel pressure.
- GRAND GULF NUCLEAR STATION OFF-NORMAL EVENT PROCEDURE t
l
Title:
Inadequate Decay Heat lNo.:
05-1-02-III-1 l Revision:
10 lPage:
2 l
l Removal l
l l
l 4.3 Verify that a redundant component or loop is available for service.
4.4 Increase monitoring frequency of coolant temperature and reactor pressure.
5.0 SUBSEQUENT OPERATOR ACTIONS 5.1 With the RPV head installed:
5.1.1 If the in-service loop of shutdown cooling has been lost due to _ a component failure in the RHR or SSW systems, place the redundant loop in shutdown cooling per SOI 04-1-01-E12-1.
CAUTION If adequate core circulation is not maintained, you cannot be sure of an accurate coolant temperature indication.
/
5.1.2 If forced circulation has been lost due to the loss of Reactor Recirculation Pump (s),
. a Keep shutdown coolin,g' in service, add' raise reactor water lev,e,1 '
a.
to 615" actual (this is 82" above instrument zero).
This will allow natural circulation through the core and back to the feedwater annulus, with RHR sti'11 in shutdown cooling.
b.
Attempt to regain operation of at least one recirculation pump or start one intermittently to prevent stratification.
e 5.1.3 If RHR shutdown cooling capability has been completely lost, increase RWCU reject to maximum (approx.
360 gpm) and make up to the RPV with condensate and CRD.
I a.
Monitor coolant temperature and reactor pressure very closely to determine if this method will allow and maintain the f~--
required cooling.
i b.
If adequate cooling cannot be maintained, or restarted within an acceptable amount of time, refer to EP-8, Alternate Shutdown Cooling.
5.2 With the RPV head removed:
5.2.1 With the upper pools filled i
Notify the refuelling crew immediately of a significant change a.
in circulation or change in shutdown cooling, if applicable.
NOTE Changing circulation flow or swapping RHR loops may significantly af fect clarity of the water in the vessel, and in the upper pools if they are filled.
p
-w e - -
,-1
- - - - +, - -.
w-e r
r
_.. _ _ _. ~ _. _ _.
' GRAND GULF NUCLEAR STATION OFF-NORMAL EVENT PROCEDURE 9
l
Title:
Inadequate Decay Heat lNo.:
05-1-02-111-1 l Revision:
10 lPage: 3 l
l Removal l
l l-l b.
Maximize Fuel Pool Cooling, if necessary.
c.
Increase coolant temperature monitoring frequency, and re-establish shutdown cooling as soon as.possible.
5.2.2 With the upper pools not filled:
a.
Contact any personnel who may be working on the refuelling
~ floor and inform them of the problem.
b.
Increase coolant temperature monitoring frequency; and begin raising water level.
c.
Continue to raise water level if temperature is increasing
.j significant and return ' shutdown cooling to service as soon as pos sible.
{'
. ~,.
i 4
e
'U" e
'
- T. J.
e
' * ~
g w
e e,
ge -
I 1
6 4
e f
i e
m,.
.e
+ a e-
-,,.y,
,e,y
, +,. -
g
-n.