ML20216D069
| ML20216D069 | |
| Person / Time | |
|---|---|
| Site: | 05000083 |
| Issue date: | 08/13/1997 |
| From: | FLORIDA, UNIV. OF, GAINESVILLE, FL |
| To: | |
| Shared Package | |
| ML20216B358 | List: |
| References | |
| B.4, NUDOCS 9805200032 | |
| Download: ML20216D069 (5) | |
Text
_ _ _ _ _ _.
s e.
SOP-B.4 Page 1 of 5 UFfR OPERATING PROCEDURE B.4 1.0 Emergency Procedure - Flood 2.0 Approval
- a f
Reactor Safety Review Subcommittee...,[ ' t
/-cn m
/
V
' Date
//Sd?
Facility Director................. [ MN- - /
h
/
ite D
9805200032 971017
~
PDR ADOCK 05000083 PM REV 2, 8/97 y
t
s
. w SOP-B.4 Page 2 of 5 3.0 Purpose and Discussion 3.1 This procedure is intended to address actual and potential flooding conditions in the UFTR facility to include guidance as to when the procedure is to be initiated as well as guidance on reactivity control.
3.2 This procedure shall be implemented in the event that flooding of the reactor site (more than 6 inches of water above floor levelin the reactor cell) becomes likely.
3.3 From accumulated experience at the UFTR site, it has been established that no actual flooding conditions (water intrusion into the reactor cell) will exist in the UFTR site from an accumulated precipitation'of 8 inches of rainfall over a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period.
3.4 Definitions
3.4.1 " Flooding Condition" shall mean that a hurricane or other severe storm is deemed capable of depositing more than 8 inches of rain in any 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period.
3.4.2 "IIurricane Rods" is the designation for the three cadmium-covered aluminum rods normally stored in the spent fuel pit in location number 20.
3.4.2.1 Hurricane rods individually contain enough neutron absorber to be worth several dollars in negative reactivity.
3.4.2.2 The insertion of the hurricane rods assures the UFTR core will have a shutdown margin larger than 1% Ak/k with water in the core and all control blades removed.
3.4.3 Implementation of this procedare in the event of a flooding condition requires securing the UFTR; insertion of the hurricane rods is then allowed but not necessarily required depending on the nature of flooding condition.
4.0 Limits and Frecautions 4.1 All personnel associated with the reactor shall ensure that the Reactor Manager or his authorized representative is aware of any actual or probable flooding condition of the reactor cell.
4.2 If the U.S. Weather Bureau indicates a significant probability for a hurricane or other.
severe storm to produce an accumulated rainfall of more than 8 inches of rain in a 24-hour l
period or conditions exist that have or could, with a high degree of probability, result in a flooding of the reactor site (more than 6 inches of water above floor level in the reactor cell), then UFTR personnel shall implement this procedure.
)
'e**--.
- 4.,
-, v % w.
mem m mmeer w.*
a o
u+.u
..-w n
- -= sg
- o m SOP-B.4 Page 3 of 5 4.3 Because of their large negative reactivity, an attempt to withdraw a hurricane rod with the reactor operational (or control rods withdrawn or partially withdrawn) could result in a power excursion.
4.3.1 The hurricane rods should be locked in place, and/or a barrier placed so that the removal of those rods cannot be accomplished without very deliberate action.
4.3.2 It is imperative that no hurricane rod be removed from the core unless authorized by the Reactor Manager, and unless the reactor is secured (all control blades fully inserted) and all water drained from the core.
5.0 References 5.1 UFTR Safety Analysis Report
- 5.2 UFTR Technical Specifications 5.3. UFTR Emergency Plan l
6.0 Records Required 6.1 UFTR Operating Log 7.0 Instructions 7.1 Assessing Potential for Flooding Condition 7.1.1 If a hurricane or any other severe storm is deemed capable of depositing more than 8 inches of rain in any 24-hour period, the cognizant personnel will obtain forecast information from the U.S. Weather Bureau in Jacksonville (direct telephone with 24-hour service for recorded forecast information is 904-741-4311, and 24-hour telephone communication with weather station personnel is 904-741-4411) that will be used to assess the situation. - The applicable telephone numbers are on Emergency Call List #2 posted in the Control Room, with the console copy of the SOP Manual, and at the Emergency Support Center as well'as other locations throughout the facility.
Equivalent sources of forecast data may also be used.
7.i.2 The Reactor Operator shall, aaytime a likely emergency flooding condition is i
established, insure that the reactor is secured.
I i
REV 2, 8/97
-.a. u.
o -,
v SOP-B.4 Page 4 of 5 l
l 7.2 Inserting the llurricane Rods 7.2.1 ;f conditions indicate the possibility of flooding conditions, any reactor operator may (preferably at the request of the Reactor Manager or Facility Director) insert the hurricane rods into the vertical ports; the following steps shall be followed:
7.2.1.1 Unlock the three vertical ports and remove both shic!d plugs from each port.
7.2.1.2 Unlock and remove the hurricane rods from the spent fuel pit.
7.2.1.3 Lower one hurricane rod carefully into each if the vertical ports, using the attached line.
7.2.1.4 Place the vertical port locking devices in place (the vertical ports should also be physically blocked or barricaded, if possible).
7.2.1.5 Enter into the operating log that the hurricane rods are installed in the reactor "ertical ports, i
l CAUTION The hurricane rods shall only be removed using Section 7.4 of this procedure (UFfR SOP-B.4). They may be removed only when authorized by the Reactor Manager or duly authorized reprer tative.
l l
7.3 Termination of a Flooding Condition 7.3.1 Only the Reactor Manager or a duly authorized representative shall determine that the flooding condition is terminated; termination of the flooding condition shall be verified by an entry to this effect in the UFTR Operating Log.
7.4 Removing the IIurricane Rods from the Core 7.4.1 No attempt is to be made to remove any of the hurricane rods from the vertical ports unless ALL of the following conditions are satisfied:
7.4.1.1 The Reactor Manager or duly authorized representative has terminated the flooding condition.
l 7.4.1.2 The Reactor Manager or duly authorized representative has authorized removal of the hurricane rods and the authorization is entered in the UFTR Operating Log.
l l
REV 2, 8/97 1
l
l o *. -
SOI'-B.4 Page 5 of 5 7.4.1.3 Only a licensed Reactor Operator may remove a hurricane rod.
7.4.1.4 The reactor operator removing a hurricane rod as per this procedure shall verify and note by operating log entry the following reactor status:
7.4.1.4.1 The reactor is secured (includes full insertion of all control blades and removal '
of the control console key).
7.4.1.4.2 Water is drained from the core.
7.4.2 When the conditions for hurricane rod removal are met as listed in Section 7.4.1, the reactor operator may remove the rods; the following steps shall be utilized for the removal.
7.4.2.1 Lay absorbent paper near the vertical ports.
7.4.2.2 Remove the barriers from the vertical ports.
7.4.2.3 Unlock the vertical ports.
7.4.2.4 Using appropriate radiological precautions, remove the hurricane rods slowly from the reactor and place them on the absorbent paper.
7.4.2.5 Check the hurricane rods for contamination and (if necessary) decontaminate them before storing.
7.4.2.6 Store the hurricane rods in the assigned spent fuel pit location.
7.4.2.7 Restore the vertical ports to normal status.
7.4.2.8 Record removal and disposition of the hurricane rods in the UFTR Operating Iog.
I 7.4.2.9 Inform the Reactor Manager or duly authorized representative when action is completed.
REV 2, 8/97